Asked by Hyde

​Angles A and B are located in the first quadrant. If sin a =5/13 and cos b= 3/5 , determine the exact value of cos (a+b) .
Answered by Steve
well, we have

cosa = 12/13
sinb = 4/5

So, just plug them into

cos(a+b) = cosa cosb - sina sinb
Answered by Hyde
I got the answer .22882 is that correct?
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