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