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Mathematics
OpenStudy (anonymous):

Find the exact value of cos(u+v) given that sin u=7/25 and cos v=-12/13. (Both u and v are in Quadrant II)

OpenStudy (anonymous):

do you know the cosine of the sum of two angles u and v?

OpenStudy (anonymous):

the sum formula is cos(u+v)= cosu cosv- sinu sinv. i just can't figure out how to find cosu and sinv.

OpenStudy (anonymous):

best is to draw a triangle... hang on...

OpenStudy (anonymous):

|dw:1338145459140:dw| can you put the missing side in each triangle?

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