Posted by **leo** on Tuesday, April 13, 2010 at 7:49pm.

Prove the trig identity

cos(4x)=2-sec^2(2x)/sec^2(2x)

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March 23, 2017
Posted by **leo** on Tuesday, April 13, 2010 at 7:49pm.

Prove the trig identity

cos(4x)=2-sec^2(2x)/sec^2(2x)

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