જો $\int \cos x \log \left(\tan \frac{x}{2}\right) dx = \sin x \log \left(\tan \frac{x}{2}\right) + f(x)$ હોય, તો $f(x)$ બરાબર શું થાય? (ધારો કે $c$ એ સ્વૈચ્છિક વાસ્તવિક અચળાંક છે.)

  • A
    $c$
  • B
    $c-x$
  • C
    $c+x$
  • D
    $2x+c$

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જો $\int \tan^{-1} x \, dx = Ax \tan^{-1} x + B \log(1 + x^2) + C$ હોય, તો $A + B = \_\_\_\_$

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