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$Old$ July 4th, 2009, 08:12 AM

matsci0000 $matsci0000 is offline$

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$Old$ July 4th, 2009, 08:19 AM

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$sin^2(n+1)A-sin^2nA$

= $\frac{\cos{2nA}-\cos{(2n+2)A}}{2}$

= $\sin(2n+1)A\sin A$

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