Question

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

Answer 1

Answer:

Sec 90

Step-by-step explanation:

Sec 90 is equals to -1

Answer 2

Answer:

csc 270°

Step-by-step explanation:

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

sin 180° = 0

csc 270° = 1/sin 270° = 1/-1 = -1