Question

Find the EXACT value of sec (-120 degrees)

Answer 1

Well sec(-120) = 1/cos(-120).

We know that cos(-120) = -1/2.

So, 1/(-1/2) = -2.

This means that sec(-120) = -2.

Answer 2

Sec is 1/cos so sec -120 is 1/cos -120 which is -2