October 6, 2015

Homework Help: Math

Posted by Jenn on Sunday, November 8, 2009 at 10:24pm.

Angle x is in the second quadrant and angle y is in the first quadrant such that sinx=5/13 and cosy=3/5, determine and exact value for cos (x+y).
I have no idea how to even start this question. Could someone please help me?

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