यदि $\int \frac{1+\cos (4 x)}{\cot (x)-\tan (x)} d x=A \cos (4 x)+B$ है,तो $A$ का मान ज्ञात कीजिए।

  • A
    $\frac{-1}{2}$
  • B
    $\frac{-1}{4}$
  • C
    $\frac{-1}{3}$
  • D
    $\frac{-1}{8}$

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निम्नलिखित समाकलन ज्ञात कीजिए: $\int \frac{\sec ^{2} x}{\operatorname{cosec}^{2} x} d x$

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