use calculator and appropriate identities to evaluate function below. thank you in advance

a) cos^-1(-0.5)

b)

#### Top Answer

a) cos − 1 ( − 0 . 5 ) = 1 2 0 ∘ or... View the full answer

- Can you show more work on question A pls
- bornyto
- Jun 09, 2018 at 4:14pm

- The inverse function of y=cos(x) is the function x=cos^-1(y), so if cos(120°)=-0.5 then cos^-1(-0.5)=120° is fulfilled.
- mperez900
- Jun 09, 2018 at 6:10pm