Asked by Matt

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.)
Answered by oobleck
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
Answered by Matt
Answer: cos(u+v)=528/697
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