Question

Which of the following expressions is equal to -1? Help plzzz

Answer 1

Sec 90

Explanation:

Sec 90 is equals to -1

Answer 2

csc 270°

Explanation:

sec 90° = 1/cos 90° = 1/0 which is undefined

sin 180° = 0

csc 270° = 1/sin 270° = 1/-1 = -1