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September 17, 2014

September 17, 2014

Posted by **Amirul Thaqif** on Saturday, February 2, 2013 at 10:54am.

- math -
**Steve**, Saturday, February 2, 2013 at 5:22pmonly if theta = 0 or pi

since cos^2 θ - sin^2 θ = cos2θ

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