Why is mathematic study is so hard?

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Description : Left to themselves, will a human child develop basic mathematic skills?

Last Answer : answer:Good question, not sure. If a child grew up with no basic mathematical training, 1+1=2 etc. I am sure, the human child would, eventually, make associations with the amounts of particular items, ... sort of thing. Look at how little children think that 10 pennies are more than one Dime. haha

Description : How to solve this trigonometric mathematic function? (Details inside)

Last Answer : answer:According to this wiki article, subtracting two arcsines can be rewritten as the arcsine of the first number times the square root of 1 minus the second number squared, minus the second number times the square root ... sqrt(1-b^2) - b*sqrt(1-a^2)) Does that point you in the right direction?