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OpenStudy (anonymous):
sinx=1/5 and cos y= -12/13, find cos (x+y)
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OpenStudy (anonymous):
Here's a trig identity which should help: \[\cos(a+b)=\cos(a)\cos(b)-\sin(a)\sin(b)\]Think you can solve it now?
OpenStudy (anonymous):
I think so but could someone find the final answer to see if I got it right?
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