How to work out trig formulas in your head?

How to work out trig formulas in your head?
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1 Answer

Answer :

Memorize and be able to recreate this.
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Last minute explanations on Trig Identities.

Description : Last minute explanations on Trig Identities.

Last Answer : I don't know how to do 1-3 and 5 or maybe I forgot, but I can help with 4. THE ZERO WITH THE BELT ACROSS=X 4. (1-cotX)^2 = csc^2 X -2cotX (1-cotX)(1-cotX) = csc^2 X - ... notes or cheat-sheets on your final? You can always wake up early tomorrow to ask your teacher for help or stay after school

Simply maths question about rearranging formulas?

Description : Simply maths question about rearranging formulas?

Last Answer : answer:I'm not sure I quite remember how to do these types of problems. What I can offer is 0=0 is the answer I came up with quickly by trying to solve the equation. I couldn't find my old calc notebook, but you ... the left side uv = u^2+uv - u^2 subtraction of u^2 uv = uv divide by uv 0 = 0

Help with trig homework?

Description : Help with trig homework?

Last Answer : answer:Welcome to Fluther. Perhaps this page will help you in better understanding (and calculating) degrees-minutes-seconds to decimal degrees, and vice versa.

A garrison of 3300 men has provisions for 32 days, when given at a rate of 850 grams per head. At the end of 7 days are inforcement arrives and it was found that now the provisions will last 8 days less, when given at the rate of 825 grams per head. How, many more men can it feed?

Description : A garrison of 3300 men has provisions for 32 days, when given at a rate of 850 grams per head. At the end of 7 days are inforcement arrives and it was found that now the provisions will last 8 days less, when given at the rate of 825 grams per head. How, many more men can it feed?

Last Answer : Answer: 1700 men.

Can you help me to work this out?

Description : Can you help me to work this out?

Last Answer : You bought it for $75,00.

How do I work out this statistical problem ?

Description : How do I work out this statistical problem ?

Last Answer : answer:do you get chips when a certian number is picked? do you get the number of chips picked by the RNG? For a question like this, you need to be specific.

Is there a mathematical way to work out uncertainty of something when that uncertainty has uncertainty and so on?

Description : Is there a mathematical way to work out uncertainty of something when that uncertainty has uncertainty and so on?

Last Answer : Statistics and the bell curve measuring standard deviation.

How do you work out coefficients?

Description : How do you work out coefficients?

Last Answer : First of all, thank you for asking the question this way, so that we can answer without feeling like we're doing your homework for you. That's a good thing. But the downside is your ... missing something-it wouldn't be the first time!-but you have definitely misstated something. Try again, please.

Brain Teaser: Why does this trick work?

Description : Brain Teaser: Why does this trick work?

Last Answer : Let's try it. Starting: 4 6 20 800 38 72 First iteration, replacing 4 and 38: (4 * 38) + (4 + 38) = 152 + 42 = 194 Result (new number in italics): 194 6 20 800 72 Second iteration, replacing 6 and ... two left. How am I going to get to one, and how am I going to get an odd number out of all evens?

Brain Teaser - How does this work?

Description : Brain Teaser - How does this work?

Last Answer : Starting with n numbers a(1), a(2), ..., a(n) we will always end up with (a(1)+1) ( a(2)+1)...(a(n)+1) -1. The reason is that ab+a+b = (a+1)(b+1) - 1 One way to prove the above ... .(a(n)+1) -1 Calculating (a+1)(b+1)-1 proves the statement for n, which shows the statement is true by induction on n.

Why does a Burrows-Wheeler Transformation work?

Description : Why does a Burrows-Wheeler Transformation work?

Last Answer : answer:Good question. Reading the Wikipedia article, I think this line gets close to your So it can be seen that the success of this transform depends upon one value having a high probability ... we'd be getting into some serious statistical mathematics which I'm not currently well versed in.

Thirty men take 20 days to complete a job working 9 hours a day. How many hour a day should 40 men work to complete the job? (a) 8 hrs (b) 7 1/2 hrs (c) 7 hrs (d) 9 hrs

Description : Thirty men take 20 days to complete a job working 9 hours a day. How many hour a day should 40 men work to complete the job? (a) 8 hrs (b) 7 1/2 hrs (c) 7 hrs (d) 9 hrs

Last Answer : (b) 7 1/2 hrs

Pipe A can fill an empty tank in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins. If all of them work together, find the time taken to fill the tank? (a) 17 1/7 mins (b) 20 mins (c) 8 mins (d) none of these

Description : Pipe A can fill an empty tank in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins. If all of them work together, find the time taken to fill the tank? (a) 17 1/7 mins (b) 20 mins (c) 8 mins (d) none of these

Last Answer : (a) 17 1/7 mins

Is there a calculation in which infinities cancels out?

Description : Is there a calculation in which infinities cancels out?

Last Answer : There are many asymptotic functions that are expressed as the x or y value approaches infinity. They are not at all uncommon. And the ratio of two such functions would define something like a line. Students of Analytic Geometry as well as Calculus are quite familiar with the occurrence of infinity.

If the universe turns out to be granular (meaning there is a smallest length and a smallest unit of time), is mathematics as it exists today a flawed, or even the wrong tool to describe reality?

Description : If the universe turns out to be granular (meaning there is a smallest length and a smallest unit of time), is mathematics as it exists today a flawed, or even the wrong tool to describe reality?

Last Answer : That’s irrational. Sure I will agree will you.

Need help figuring out my final grade for the semester.

Description : Need help figuring out my final grade for the semester.

Last Answer : answer:79.1% * 50% + 80% * 15% + 60% * 35% = 0.7297 Your final grade would be 72.97%, assuming the minimum score for both the paper and the essay.

What is the percentage of 170 out of 440?

Description : What is the percentage of 170 out of 440?

Last Answer : Divide 170 by 440; or 17 by 44, which is the same thing.

Can someone help me out with my math homework?

Description : Can someone help me out with my math homework?

Last Answer : answer:Sure. Here on Fluther, we're not allowed to tell you exactly how to do a homework problem, but I can point you in the right direction. The slope-intercept formula for a line is y=mx+b, ... the y intercept, you still have two points. Hint: The x coordinate of the y intercept is always 0.

Can anyone help me figure out my math problem?

Description : Can anyone help me figure out my math problem?

Last Answer : answer:Hmm (9–2x) (5–2x) – 45 (7x) (3x) – 45 21 – 45x = -24 looks right but its been a while, you just got it positve.

How do I figure out this simple math fraction?

Description : How do I figure out this simple math fraction?

Last Answer : Do you mean 93¼ percent? Because 93¼ really is 93.25.

Working out how many left and right turns I can take before I run into my path?

Description : Working out how many left and right turns I can take before I run into my path?

Last Answer : answer:Hm . Well if there are 10 segments, then there are 9 joins. Each joint can be bent left, right or straight. So an upper bound would be 3^9 = 19683. That doesn't account for the fail ... than that. You can't just tally the lefts or rights either. Because LLSLSL is okay, but LLLLSS is not.

In math, using decimals, how would 10.01 be written out in words?

Description : In math, using decimals, how would 10.01 be written out in words?

Last Answer : Well, I’d say ten point o-one, but yes, 0.01 is one hundredth, so 10.01 is ten units and one hundredth.

What are these math problems called and how do you figure them out?

Description : What are these math problems called and how do you figure them out?

Last Answer : ? What math problems?

Can you figure out this math problem?

Description : Can you figure out this math problem?

Last Answer : I’m Too stupid…

Factoring out the square root?

Description : Factoring out the square root?

Last Answer : I am doing this on my fingers; the square roots that factor out seem to be 1, 4, and 64. Can’t you simply memorize the trig functions of a 30–60-90 triangle?

Out of the following linear equations in two variables, the two representing a pair of parallel lines graphically are: 3x - 4y = 6 3x + 4y = 6 6x + 8y = 12 6x - 8y + 6 = 0 (a) 3x - 4y = 6 and 6x + 8y = 12 (b) 3x - 4y = 6 and 6x - 8y + 6 = 0 (c) 6x + 8y = 12 and 3x + 4y = 6 (d) 6x - 8y + 6 = 0 and 3x + 4y = 6

Description : Out of the following linear equations in two variables, the two representing a pair of parallel lines graphically are: 3x - 4y = 6 3x + 4y = 6 6x + 8y = 12 6x - 8y + 6 = 0 (a) 3x - 4y = 6 and 6x + 8y = 12 (b) 3x - 4y = 6 ... 6 = 0 (c) 6x + 8y = 12 and 3x + 4y = 6 (d) 6x - 8y + 6 = 0 and 3x + 4y = 6

Last Answer : (b) 3x - 4y = 6 and 6x - 8y + 6 = 0

Can you find out what day of the week was January 12, 1979?

Description : Can you find out what day of the week was January 12, 1979?

Last Answer : Answer: Friday.

Three cards are drawn at random from an ordinary pack of cards. Find out the probability that they will consist of a king, aqueen and an ace?

Description : Three cards are drawn at random from an ordinary pack of cards. Find out the probability that they will consist of a king, aqueen and an ace?

Last Answer : Answer: 64/2210.

Mr. Sharma decided to walk down the escalator of a tube station. He found that if he walks down 26 steps, he requires 30 seconds to reach the bottom. However, if he steps down 34 stairs he would only require 18 seconds to get to the bottom. If the time is measured from the moment the top step begins to descend to the time he steps off the last step at the bottom, find out the height of the stair way in steps?

Description : Mr. Sharma decided to walk down the escalator of a tube station. He found that if he walks down 26 steps, he requires 30 seconds to reach the bottom. However, if he steps down 34 stairs he would only ... time he steps off the last step at the bottom, find out the height of the stair way in steps?

Last Answer : Answer: 46 steps.

Is it possible to solve a magic square made up of a system of unknown symbols?

Description : Is it possible to solve a magic square made up of a system of unknown symbols?

Last Answer : No. I could populate a 9×9 magic square with the letters A through I. You would never figure out what numbers were represented by the letters because a 9×9 magic square is not unique.

Did we invent math,or did we discover it?

Description : Did we invent math,or did we discover it?

Last Answer : God invented it.

How many of you can pass this simple test?

Description : How many of you can pass this simple test?

Last Answer : I can.

How can two infinite sets not have one to one correspondence with each other?

Description : How can two infinite sets not have one to one correspondence with each other?

Last Answer : You've missed what an infinite set means. Consider this definition: Infinite sets are the sets containing an uncountable or infinite number of elements. Infinite sets are also called uncountable sets. That is ... . Or for the set of all positive integers and the set of all negative integers .

Using the rays in the diagram, how many different acute angles can be formed?

Description : Using the rays in the diagram, how many different acute angles can be formed?

Last Answer : We don’t do your homework, but this is a simple combinatorics problem. Any pair of those rays will form an acute angle. How many pairs are there?

Can someone help me with my math assignment?

Description : Can someone help me with my math assignment?

Last Answer : We don't do people's homework here, but we can help in other ways. For instance, some of us can suggest an approach. One would hope, though, that your instructor has already prepared you to ... you take your shot at answering the question, and then post your answer and ask if others will comment?

What’s 0.222222222... as a simplified fraction?

Description : What’s 0.222222222... as a simplified fraction?

Last Answer : 2/9

If somebody choose two digit and three digit numbers and their difference is 989.What will be their sum? a) 1000 b)1010 c) 1006?

Description : If somebody choose two digit and three digit numbers and their difference is 989.What will be their sum? a) 1000 b)1010 c) 1006?

Last Answer : None of the above. Let x be the three digit number and y be the two digit number. x - y =989. x = 989 + y. x is obviously greater than 989 and less than 1000 (since it is three digits). Since y is a two digit number ... 989 + 10 = 999. We can't go any higher, so x =999 and y=10. x+y = 999+10 = 1009

What do you think of this YouTube video on why you can't divide by zero?

Description : What do you think of this YouTube video on why you can't divide by zero?

Last Answer : Also are the symbols for Eternity and infinity the same? ∞

Have you ever forgotten something that you didn't think you ever COULD forget?

Description : Have you ever forgotten something that you didn't think you ever COULD forget?

Last Answer : I still forget my neighbours name. I have known her for 3 years. I forgotten the quadric equation. I remember some math mnemonics but had to look up SOHCAHTOA and roy'g'biv to answer this question. I ... simple things every now and again , and have to look them up online , Fluther , or call family.

How many miles will a person run during a 10 kilometer race?

Description : How many miles will a person run during a 10 kilometer race?

Last Answer : What kind of mile? There are many.

A magazine company conducted a phone survey asking subscribers to identify the brand of outdoor camping equipment they like best. Every subscriber was surveyed, and the results were printed in an article titled “Most Popular Equipment among All Campers.” Why is the title of the article misleading?

Description : A magazine company conducted a phone survey asking subscribers to identify the brand of outdoor camping equipment they like best. Every subscriber was surveyed, and the results were printed in an article titled “Most Popular Equipment among All Campers.” Why is the title of the article misleading?

Last Answer : For view, of course. Edit: ok, now I confused. Are you asking what makes the title misleading, or why the magazine makes the misleading title?

Why do polls say that they are accurate + - 3.00% of the time 19/20?

Description : Why do polls say that they are accurate + - 3.00% of the time 19/20?

Last Answer : Maybe it should be + – 3.05%

What do you think of this paper?

Description : What do you think of this paper?

Last Answer : The Riemann Hypothesis is one of the most famous of all mathematical problems. If it had been proved it would be newsworthy and we would have heard about it. I am not a mathematician but this proof must be wrong. Scott Aaronson’s blog might be of some help.

What FORMULA of "nth ROOT" ? How do to obtain it with just unique formula?

Description : What FORMULA of "nth ROOT" ? How do to obtain it with just unique formula?

Last Answer : https://en.wikipedia.org/wiki/Nth_root_algorithm

How can we derive the expression for cross product of two vectors?

Description : How can we derive the expression for cross product of two vectors?

Last Answer : Here is a video that shows where the term cross comes from. Two vectors in a 3D space when “multiplied” by each other result in a third vector that represents how they “cross” each other.

What is the probability of getting two pinks balls?

Description : What is the probability of getting two pinks balls?

Last Answer : Wow. There are two ways of solving this question. One way uses recursive probability theory and the other way uses an elegant guess. Wrong site for mathematics questions?

To the nearest 10%, what percentage of all numbers contain a 9?

Description : To the nearest 10%, what percentage of all numbers contain a 9?

Last Answer : You probably need to clarify that you mean what percentage of the set of all integers contains the digit 9'? Because there are an infinite number of numbers that don't contain that digit (and ... is also an infinite set of digits that does not. Maybe you need to restrict your range some more.

Hey guys, does anyone know the factored form of x3-2x2-x+2?

Description : Hey guys, does anyone know the factored form of x3-2x2-x+2?

Last Answer : Welcome to Fluther. Two things: 1. We don't do homework problems or provide answers. If you ask a question of the how do I ? variety, we are much more accommodating. That's just how we roll. (And it ... in a way that'll help you to understand it or get credit for it. But the answer is out there.

Will my final grade drop to a c?

Description : Will my final grade drop to a c?

Last Answer : Do the math.

Does a Riemann like hypothesis exist for 10 dimensions?

Description : Does a Riemann like hypothesis exist for 10 dimensions?

Last Answer : The Riemann Hypothesis has to do with the distribution of prime numbers and has nothing to do with other dimensions as far as I know.