So basically I know what the answer is to the problem and the steps on how to get there, but during the steps I'm not sure why one thing happens.(adsbygoogle = window.adsbygoogle || []).push({});

sec(7pi/6)

=1/(cos7pi/6)

=1/(-cos(pi/6)/ <--- I'm not sure why the 7 disappears in this step and the cos becomes negative.

I get the feeling this is something I should know, but it's been a while. Any help would be appreciated.

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# Homework Help: Exact values of trig functions.

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