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Evaluate : int(1+x^2)/(1+x^4)dx...

Evaluate : `int(1+x^2)/(1+x^4)dx`

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`I=int frac{x^{2}+1}{x^{4}+1} d x`

`I=int frac{x^{2}(1+frac{1}{x^{2}})}{x^{2}(x^{2}+frac{1}{x^{2}})} d x`

`I=int frac{(1+frac{1}{x^{2}}) d x}{(x^{2}+frac{1}{x^{2}})}`

`I=int frac{(1+frac{1}{x^{2}}) d x}{(x-frac{1}{x})^{2}+2 x times frac{1}{x}}` ...
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