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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 : `sin^4 alpha+ sin^4 beta= 2 sin^2 alpha sin^2 beta` .

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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