If `(cos^4A)/(cos^2B)+(sin^4A)/(sin^2B)=1`, then prove that
(i) `sin^4A+sin^4B=2 sin^2Asin^2B`
(ii) `(cos^4B)/(cos^2A)+(sin^4B)/(sin^2A)=1`

Explanation

To prove the given statements based on the equation

\[ \frac{\cos^4 A}{\cos^2 B} + \frac{\sin^4 A}{\sin^2 B} = 1, \]

we will tackle each part step by step.

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