જો $\int \frac{1+\cos (4 x)}{\cot (x)-\tan (x)} d x=k \cos (4 x)+c$ હોય,તો

  • A
    $k=\frac{1}{8}$
  • B
    $k=\frac{1}{4}$
  • C
    $k=\frac{-1}{8}$
  • D
    $k=\frac{-1}{4}$

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$\int {\frac{{\cos 2x + 2{{\sin }^2}x}}{{{{\cos }^2}x}}dx} = $

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