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September 19, 2014

September 19, 2014

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

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 7:43pmif 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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