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Prove that $\cos^2\alpha (1-\tan^2\alpha)=\cos 2\alpha$
in Grade 12 Maths by Bronze Status (5.9k points) | 16 views

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LHS, cosa^2 - cosa^2 x sina^2/cosa^2

     = cosa^2 - sina^2

= cos2a  , double angle identity , proven
by Diamond (82.9k points)

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