यह दिया गया है कि $\frac{d}{dt}(t \log t - t) = \log t$. तो, $\exp \left( \int_0^1 2x \log(1+x^2) dx \right) = $

  • A
    $e$
  • B
    $2$
  • C
    $\frac{4}{e}$
  • D
    $\frac{e}{4}$

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निश्चित समाकलन $\int_{0}^{1} \frac{x}{x^{2}+1} d x$ का मान ज्ञात कीजिए।

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