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OpenStudy (anonymous):
tan^2(x)=1 − cos(2x)/1 + cos(2x)
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OpenStudy (anonymous):
tan^2x= 1- cos2x/1+cos2x tan^2x= sin^2x/cos^2x sin^2x=1-cos2x/2 cos^2x= 1+ cos2x/2 tan^2x=1-cos2x/1+cos2x
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