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posted by Ada Enugu on Tuesday, January 29, 2013 at 1:04am.
If A and B are acute angle such that SinA=8/17 and CosB=3/5.Find 1, Cos(A+B) 2, Sin(A+B) 3, Sin(A-B)
draw triangles to see that cosA = 15/17 sinB = 4/5 now, use your angle sum formulas. What do you get?
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