यदि $\int \frac{\log _e(x+\sqrt{1+x^2})}{\sqrt{1+x^2}} dx = f(g(x)) + c$ है, तो:

  • A
    $f(x) = \frac{x^2}{2}, g(x) = \log _e(x+\sqrt{1+x^2})$
  • B
    $f(x) = \log _e(x+\sqrt{1+x^2}), g(x) = \frac{x^2}{2}$
  • C
    $f(x) = x^2, g(x) = \log _e(x+\sqrt{1+x^2})$
  • D
    $f(x) = \log _e(x-\sqrt{1+x^2}), g(x) = x^2$

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$f(x) = \frac{x}{1 + x^2}$ का एक आदि फलन (primitive) है:

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