Asked by Maryanne

If sin A = 3/5 and cos B = 24/25 and <A and <B are both in quadrant 1, what is the exact value of cos (A-B) ? Help please
Answered by Steve
well, you know

cosA = 4/5
sinB = 7/25
cos(A-B) = cosAcosB - sinAsinB

just plug in the numbers
Answered by Steve
oops that's
cos(A-B) = cosAcosB + sinAsinB
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