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August 20, 2014

August 20, 2014

Posted by **Ada Enugu** on Tuesday, January 29, 2013 at 1:04am.

1, Cos(A+B)

2, Sin(A+B)

3, Sin(A-B)

- Math -
**Steve**, Tuesday, January 29, 2013 at 10:42amdraw triangles to see that

cosA = 15/17

sinB = 4/5

now, use your angle sum formulas. What do you get?

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