यदि $\int \sqrt{x-\frac{1}{x}}\left(\frac{x^{2}+1}{x^{2}}\right) d x=\frac{2}{3}\left(x-\frac{1}{x}\right)^{k}+c$ है,तो $k$ का मान ज्ञात कीजिए।

  • A
    $\frac{2}{3}$
  • B
    $\frac{3}{2}$
  • C
    $\frac{5}{2}$
  • D
    $\frac{2}{5}$

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$\int x^{2019} \cdot e^{x^{2020}} \, dx = $ . . . . . . $+ C$.

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$\int \frac{1}{\sqrt{x}} \sin \sqrt{x} \, dx = $

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