We can rewrite the denominator as \(\sin^4 x + \cos^4 x = (\sin^2 x)^2 + (\cos^2 x)^2\).
Using the identity \(\sin^2 x + \cos^2 x = 1\), we can rewrite the denominator as \(1 - 2\sin^2 x \cos^2 x\).
Now, let's rewrite the numerator. We can use the double angle
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