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

If `(cos^4A)/(cos^2B)+(sin^4A)/(sin^2B)=1` Prove that :

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If (cos^4A)/(cos^2B)+(sin^4A)/(sin^2B)=1 then prove that (cos^4B)/(cos^2A)+(sin^4B)/(sin^2A)=1

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