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(1 - tan2x)/(1 + tan2x) = (1 - sin2x/cos2x)/(1 + sin2x/cos2x)

= (cos2x - sin2x)/(cos2x + sin2x)

= (cos2x - sin2x)/1 = (cos2x - sin2x) = cos(2x)

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โˆ™ 2013-12-21 21:03:26
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