यदि $\int \frac{\sin x}{\cos x(1+\cos x)} d x=f(x)+c$ है, तो $f(x)$ किसके बराबर है?

  • A
    $\log \left|\frac{1+\cos x}{\cos x}\right|$
  • B
    $\log \left|\frac{\cos x}{1+\cos x}\right|$
  • C
    $\log \left|\frac{\sin x}{1+\sin x}\right|$
  • D
    $\log \left|\frac{1+\sin x}{\sin x}\right|$

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$\int \sin^3 x \cdot \cos x \, dx = $

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