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February 1, 2015

February 1, 2015

Posted by **Emily** on Sunday, May 22, 2011 at 4:16pm.

- Pre-Calc -
**Reiny**, Sunday, May 22, 2011 at 4:48pmyou could do this ...

cot(x + pi)

= cos(x+π)/sin(x+π)

= -cosx/-sinx

= cotx

or

cot(x+π) = 1/tan(x+π) ,

= 1/tanx , since x+π is in quadrant III and according to CAST, in III the tangent is positive.

= cotx

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