यदि $f(t) = \int_{-t}^{t} \frac{dx}{1 + x^2}$ है,तो $f'(1)$ का मान क्या है?

  • A
    $0$
  • B
    $2/3$
  • C
    $-1$
  • D
    $1$

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माना $\alpha > 0$ है। यदि $\int \limits _0^\alpha \frac{ x }{\sqrt{ x +\alpha}-\sqrt{ x }} dx =\frac{16+20 \sqrt{2}}{15}$ है,तो $\alpha$ का मान ज्ञात कीजिए:

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