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Find the exact value of cos(u + v) ) given that sin u= 9/41 cos nu=- 15/17 . (Both u and v are in Quadrant II.)

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  1. in QII
    sinu = 9/41
    cosu = -40/41
    cosv = -15/17
    sinv = 8/17
    cos(u+v) = cosu cosv - sinu sinv
    so plug in your numbers

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  2. Answer: cos(u+v)=528/697

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