# Question #8842f

##### 1 Answer

Sep 23, 2017

All you need to do is plug

#f'(x)=-sinx-4sec^2x#

#f'(5)=-sin(5)-4sec^2(5)#

You can plug this straight into something like Wolfram Alpha.

On a calculator, depending on what type you have, you may not have the

#f'(5)=-sin(5)-4/(cos(5))^2#

I also assume you're working with radians. Without knowing how many digits you need, you should get:

#f'(5)=-48.75260255517...#