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\(\displaystyle{ \int_{}^{} \frac{1}{1+( \frac{1}{x})^{2} }}\)

\(\displaystyle{ \frac{1}{1+( \frac{1}{x})^{2} }=\frac{x^2}{x^2+1}=\frac{x^2+1-1}{x^2+1}}\)

Q.

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