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

Answer 1

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)

Answer 2

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