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August 31, 2015

Homework Help: trig

Posted by jj reddick on Sunday, October 24, 2010 at 11:23pm.

suppose sin(x)=4/5 and cos(y)=-12/13, and x and y are in the second quadrant. determine the value of each expression: sin(x+y), cos(x-y), cos2x, sin2y.

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