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Evaluate: int1/(sin^4x+cos^4x)\ dx...

Evaluate: `int1/(sin^4x+cos^4x)\ dx`

Text Solution

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`I=int frac{1}{sin ^{4} x+cos ^{4} x} d x`
`implies int frac{sec ^{4} x}{1+tan ^{4} x} d x`
Let `tan x=t`
`implies sec ^{2} x d x=d t`
...
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