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September 23, 2014

September 23, 2014

Posted by **Anonymous** on Thursday, January 20, 2011 at 2:55am.

- trig -
**Damon**, Thursday, January 20, 2011 at 6:02amin Q2 sine is negative

sin^2 + cos^2 = 1

sin^2 = 1 - 16/25 = 9/25

sin = +/- 3/5

so sin A = -3/5

sin 2A = 2 sin A cos A

=2 (-3/5)(-4/5) = 24/25

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