Question

Cos^(-1)(cos(-π/3))
Find its value

Answer 1

Answer:

60 degrees or pi/3 rad

Step-by-step explanation:

cos(-x)=cosx

cos(-pi/3)=cos(pi/3)

cos(pi/3)=cos 60= 1/2

now the question became cos^-1(1/2)

cos^-1(1/2)=60 degrees or pi/3 rad

Answer 2

Step-by-step explanation:

1/cos * cos ( - pie / 3 )

cos and cos will be cancelled

- pie /3

- 22/7 /3

-22/21