$x \in [0, 1]$ માટે $\int_0^x \frac{t^2}{1+t^4} dt = 2x - 1$ હોય તેવી ભિન્ન $x$ ની કુલ સંખ્યા કેટલી છે?

  • A
    $1$
  • B
    $5$
  • C
    $4$
  • D
    $2$

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ધારો કે $0 < \alpha < \beta < 1$. તો $\lim_{n \rightarrow \infty} \sum_{k=1}^{n} \int_{1/(k+\beta)}^{1/(k+\alpha)} \frac{dx}{1+x}$ ની કિંમત શોધો.

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