Question

Evaluate tan^-1 (-1)

(Is the answer -pi/4??)

Answer 1

The answer is -.78

1. Plug numbers into calculator using second tan.
2. Take -45 and multiply it by pi/180
3. The result is -.78

Answer 2

The answer to is tan^-1(-1) is -45.
I don't know the answer with the pi.