निम्नलिखित में से कौन सा $TRUE$ (सत्य) है?

  • A
    $x \cdot \int \frac{dx}{x} = x \ln |x| + C$
  • B
    $x \cdot \int \frac{dx}{x} = x \ln |x| + Cx$
  • C
    $\frac{1}{\cos x} \cdot \int \cos x \, dx = \tan x + C$
  • D
    $\frac{1}{\cos x} \cdot \int \cos x \, dx = x + C$

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$\int \sec x \, dx = $

यदि $\int \frac{x^2+1}{x^4+1} dx = f(x) + c$ है,तो $f(x)$ किसके बराबर है?

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