Trigonometry XI : If tan theta = sec 2 alpha then sin 2theta =( 1- tan^4 alpha / 1+ tan^4 alpha)

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Trigonometry XI : If tan theta = sec 2 alpha then sin 2theta =( 1- tan^4 alpha / 1+ tan^4 alpha)
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SoulBoxer.
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PratikSuman-ezqr