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#1

$Old$ December 4th, 2008, 01:18 AM

Sinsane $Sinsane is offline$

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$Default$ Having some trouble

I couldnt figure this one out...can anyone?

cos(arcsin3/5 + arccos sqrt3/2)

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#2

$Old$ December 4th, 2008, 06:12 AM

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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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#3

$Old$ December 4th, 2008, 06:49 AM

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Thank you..I finally figured it out before you said something..but I appreciate the help. But its always good to make sure something is right haha.

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