જો $I = \int \frac{x^2 \, dx}{(x \sin x + \cos x)^2} = f(x) + \tan x + c$ હોય, તો $f(x)$ શું છે?

  • A
    $\frac{\sin x}{x \sin x + \cos x}$
  • B
    $\frac{1}{(x \sin x + \cos x)^2}$
  • C
    $\frac{-x}{\cos x(x \sin x + \cos x)}$
  • D
    $\frac{1}{\sin x(x \cos x + \sin x)}$

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