Homework Help: trig

Posted by Charles on Monday, September 5, 2011 at 7:27pm.

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, Monday, September 5, 2011 at 7:43pm
if the sec is -2 then the cos is -1/2

that would be 180- 60 or pi - pi/3 = 2pi/3

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