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If (cos^4 alpha)/(cos^2 beta)+ (sin^4 al...

If `(cos^4 alpha)/(cos^2 beta)+ (sin^4 alpha)/(sin^2 beta) =1`, prove that : `(cos^4 beta)/(cos^2 alpha)+ (sin^4 beta)/ (sin^2 alpha) =1`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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