Posted by Bryan on Friday, March 19, 2010 at 3:10pm.
If sin(x) = /45 and cos(y) = 5/13 with both x and y terminating in quadrant 1 find the exact value of cos(xy)
cos(4/5  5/13)
Is this what I would do?

Math  Writeacher, Friday, March 19, 2010 at 4:26pm
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