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If (cos^4alpha)/(cos^2beta)+(s in^4alpha...

If `(cos^4alpha)/(cos^2beta)+(s in^4alpha)/(s in^2beta)=1` prove that `s in^4alpha+s in^4beta=2s in^2alphas in^2beta` `(cos^4beta)/(cos^2alpha)+(s in^4beta)/(s in^2alpha)=1`

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