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February 13, 2016
Posted by **Philip** on Wednesday, November 28, 2012 at 11:09am.

Cos x

-cos x

Sin x

Sec x

-sec x

- Simplify -
**Steve**, Wednesday, November 28, 2012 at 11:14amtan(-x) = -tan(x)

so, you have

-sin/cos * 1/sin = 1/cos = sec