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September 20, 2014

September 20, 2014

Posted by **Vincent** on Wednesday, October 5, 2011 at 6:17pm.

- Math -
**Steve**, Wednesday, October 5, 2011 at 8:30pm13π/18 = 9π/18 + 4π/18 = π/2 + 2π/9

cos 13π/18 = -sin 2π/9

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