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It (cos^4A)/(cos^2B)+(sin^4A)/(sin^2B)=1...

It `(cos^4A)/(cos^2B)+(sin^4A)/(sin^2B)=1` then show that `(cos^4B)/(cos^2A)+(sin^4B)/(sin^2A)=1`

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UNITED BOOK HOUSE-MISCELLANEOUS EXERCISE-EXERCISE
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