यदि $f(x) = \cos x$ है, तो $\int \frac{e^{f(x)}(x \sin^3 x + f(x))}{1 - (f(x))^2} dx$ का मान क्या होगा?

  • A
    $e^{\cos x}(\text{cosec } x - x) + c$
  • B
    $e^{\cos x}(\text{cosec } x + x) + c$
  • C
    $e^{\cos x}(\cos x - x) + c$
  • D
    $e^{\cos x}(\cot^2 x + x) + c$

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