Find all angles which satisfy the following equation Use the

Find all angles which satisfy the following equation. (Use the parameter k as necessary to represent any integer. Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.)

sec() = 2

Solution

sec theta=2

Cos theta=1/2

Taking cosine inverse on both sides

Theta=cos ^-1(1/2)

Theta=2 pi k + pi/3 , 2 pi k -pi/3