$\int \frac{e^x}{e^x + 1} \,dx$ का मान है

  • A
    $e^x + c$
  • B
    $(e^x + 1) + c$
  • C
    $\log(e^x + 1) + c$
  • D
    इनमें से कोई नहीं

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$\int \frac{\sqrt{x^2-a^2}}{x} d x = \_\_\_\_$

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