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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$\sqrt{2} \int \frac{\sin x \, dx}{\sin \left( x - \frac{\pi}{4} \right)} = $

$\int \frac{x}{x + 2} dx$ किसके बराबर है?

यदि $\int \frac{dx}{1 + \sin x} = \tan \left( \frac{x}{2} + a \right) + b$ है,तो

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