Help with calculus please!

Question

Use your graphing calculator to find the value of f '(0) for f(x) = cos(x) - e^x.

Question options:

1)	-1
2)	0
3)	1
4)	2

Answer 1

f'(x)= -sin(x)-e^x.

f'(0) = -sin(0) -e^0

f'(0)= 0-1

=-1