જો $\int \frac{\cos 4x + 1}{\cot x - \tan x} dx = k \cos 4x + c$ હોય,તો $k$ ની કિંમત શોધો.

  • A
    $-\frac{1}{2}$
  • B
    $-\frac{1}{4}$
  • C
    $-\frac{1}{8}$
  • D
    $-1$

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જો $\int \frac{dx}{(1+\sqrt{x}) \sqrt{x-x^2}} = \frac{A \sqrt{x}}{\sqrt{1-x}} + \frac{B}{\sqrt{1-x}} + C$, જ્યાં $C$ એ વાસ્તવિક અચળાંક છે, તો $A+B$ ની કિંમત શોધો.

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