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December 21, 2014

December 21, 2014

Posted by **Help STEVE!** on Wednesday, November 28, 2012 at 10:06am.

12/25

24/25

-12/25

-7/25

-24/25

- Shasha -
**Steve**, Wednesday, November 28, 2012 at 10:15amsin2θ = 2sinθcosθ

in QIV, if cosθ = 3/5, sinθ = -4/5

so, sin2θ = 2(-4/5)(3/5) = -24/25

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