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Uploaded by brightstorm2 on May 18, 2010
Free Math Help at Brightstorm! http://www.brightstorm.com/math How to use the sine and cosine addition formulas to prove the double-angle formulas.
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it's too fast like my math teacher...
hanx1ao1n 3 days ago
You are a living Legend
ashidilkhan 2 months ago
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it's too fast like my math teacher...
hanx1ao1n 3 days ago
You are a living Legend
ashidilkhan 2 months ago