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

How to solve this trigonometric mathematic function? (Details inside)
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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 of 1 minus the first number squared: arcsin(a) – arcsine(b) = arcsine(a*sqrt(1-b^2) – b*sqrt(1-a^2)) Does that point you in the right direction?
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