tansquare theta /1+tan square theta =sinsquare theta
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tansquare theta /1+tan square theta
tansquare theta / secsquare theta
sinsquare theta / cossquare theta / 1 / cossqure theta
cos se cos cancel
sinsquare theta (hence proved)
tansquare theta / secsquare theta
sinsquare theta / cossquare theta / 1 / cossqure theta
cos se cos cancel
sinsquare theta (hence proved)
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