Posted by Charles on .
Write the expression and evaluate. There is only one answer whIch should match the range of the inverse trig function.
Sec^1(2)
I got 2pi/3
could someone tell me if that is right? And if not, could someone please explain how to get the answer.

trig 
Damon,
if the sec is 2 then the cos is 1/2
that would be 180 60 or pi  pi/3 = 2pi/3