Hi I need help on the following questions: Simplify the following expression in an exact form: $\displaystyle cos(sin^{-1}\frac{4}{5})$ P.S
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$\displaystyle \cos\left(\sin^{-1}\left(\frac{4}{5}\right)\right) = \frac{3}{5}$
Last edited by bigwave; Jan 12th 2010 at 11:53 PM. Reason: more info
can this be done without using the calculator??
you are looking at a 3,4,5 triangle
ok ic
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