यदि $\int {\frac{{{x^4} + 1}}{{x{{\left( {{x^2} + 1} \right)}^2}}}} dx = A \ln |x| + \frac{B}{{1 + {x^2}}} + c$,जहाँ $c$ समाकलन का स्थिरांक है,तो:

  • A
    $A = 1, B = -1$
  • B
    $A = -1, B = 1$
  • C
    $A = 1, B = 1$
  • D
    $A = -1, B = -1$

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$\text{यदि } \int \frac{1}{\operatorname{cosec} x+\cos x} d x = \frac{1}{2 \sqrt{3}} \log |f(x)| - \int \frac{\cos x-\sin x}{2+\sin 2 x} d x + c, \text{ तो } x = \frac{\pi}{3} \text{ पर } |f(x)| = $

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