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Using x instead of theta, cos2x/cosec2x + cos4x = cos2x*sin2x + cos4x

= cos2x*(sin2x + cos2x)

= cos2x*1 = cos2x

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βˆ™ 2013-12-21 21:18:03
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Q: How do you verify cos2 theta divided by csc2 theta plus cos4 theta equals cos2 theta?
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