$\int \frac{dx}{x(x^7 + 1)} = $

  • A
    $\log \left( \frac{x^7}{x^7 + 1} \right) + c$
  • B
    $\frac{1}{7}\log \left( \frac{x^7}{x^7 + 1} \right) + c$
  • C
    $\log \left( \frac{x^7 + 1}{x^7} \right) + c$
  • D
    $\frac{1}{7}\log \left( \frac{x^7 + 1}{x^7} \right) + c$

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$\int \frac{x^{49} \tan ^{-1}\left(x^{50}\right)}{1+x^{100}} d x=k\left(\tan ^{-1}\left(x^{50}\right)\right)^2+c$ હોય, તો $k$ ની કિંમત શોધો.

ધારો કે $n \geq 2$ માટે $f(x) = \frac{x}{(1+x^n)^{1/n}}$ અને $g(x) = \underbrace{(f \circ f \circ \ldots \circ f)}_{n \text{ વખત }}(x)$ છે. તો $\int x^{n-2} g(x) \, dx$ ની કિંમત શોધો.

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