February 19, 2017

Homework Help: Trig

Posted by Jon on Friday, February 15, 2008 at 2:23pm.

Which expression equivalent to: cos(theta + pi/2).
A)cos theta
B)-cos theta
C)sin theta
D)-sin theta

my book doesnt give examples of this but my crack at it would be C b/c distributive property? and 2cos theta = sin theta

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