definite-integral

Question: If $f(t)=\int_{\,-t}^{\,t}{\frac{dx}{1+{{x}^{2}}},}$ then ${f}'(1)$ is



1) Zero
2) 2/3
3) $-\,1$
4) 1
Solution: Explanation: No Explanation
Summation of series by definite Integration

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