definite-integral

Question: Let $f(x)=\int_{\,1}^{\,x}{\sqrt{2-{{t}^{2}}}dt}$. Then real roots of the equation ${{x}^{2}}-{f}'(x)=0$ are



1) $\pm 1$
2) $\pm \frac{1}{\sqrt{2}}$
3) $\pm \,\,\frac{1}{2}$
4) 0 and 1
Solution: Explanation: No Explanation
Summation of series by definite Integration

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