Thread: Having some trouble
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Old December 4th, 2008, 06:12 AM
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Originally Posted by Sinsane View Post
I couldnt figure this one out...can anyone?

cos(arcsin3/5 + arccos sqrt3/2)

Thanks!
Start by letting \sin^{-1} \frac{3}{5} = \alpha \Rightarrow \sin \alpha = \frac{3}{5} and \cos^{-1} \frac{\sqrt{3}}{2} = \beta \Rightarrow \cos \beta = \frac{\sqrt{3}}{2}.

Your task is to calculate \cos (\alpha + \beta). Hint: Start by applying the compound angle formula and then make the necessary substitutions.
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