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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- Jan 12th 2010, 10:49 PMPaymemoneyMore Simplifying
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 - Jan 12th 2010, 11:49 PMbigwaveexact form
$\displaystyle \cos\left(\sin^{-1}\left(\frac{4}{5}\right)\right) = \frac{3}{5}$

- Jan 13th 2010, 12:27 AMPaymemoney
can this be done without using the calculator??

- Jan 13th 2010, 12:44 AMbigwave
you are looking at a 3,4,5 triangle

- Jan 13th 2010, 01:39 AMPaymemoney
ok ic