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August 21, 2014

August 21, 2014

Posted by **Sammy** on Monday, June 25, 2012 at 8:09pm.

- Precalculus -
**Steve**, Tuesday, June 26, 2012 at 12:08amin QI, sinA=3/5 means cosA = 4/5

in QIII, cosB = -12/13 means sinB = -5/13

sin(A-B) = sinAcosB - cosAsinB = (3/5)(-12/13) - (4/5)(-5/13) = (-36+20)/65 = -16/65

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