Math

​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) .

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  1. well, we have

    cosa = 12/13
    sinb = 4/5

    So, just plug them into

    cos(a+b) = cosa cosb - sina sinb

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  2. I got the answer .22882 is that correct?

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