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If (sin^(4)alpha)/(a)+(cos^(4)alpha)/(b)...

If `(sin^(4)alpha)/(a)+(cos^(4)alpha)/(b)=(1)/(a+b)`, then show that `(sin^(8)alpha)/(a^(3))+(cos^(8)alpha)/(b^(3))=(1)/((a+b)^(3))`

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