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Posted by Daniel on Thursday, February 24, 2011 at 7:59pm.

f(x)=7cosx+6tanx, find f'(x)and f'(5pie/4)

f'(x) = -7sin x = 6 sec^2 x Plug in 5 pi/4 for x and see what you get for f'(5 pi/4)

the answer was 6sec^2x-7sinx but what would it be if you put in (5pi/4) how do u put sec^2 in the caculator

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