જો $\int {\frac{{{x^4} + 1}}{{x{{\left( {{x^2} + 1} \right)}^2}}}} dx = A \ln |x| + \frac{B}{{1 + {x^2}}} + c$,જ્યાં $c$ એ સંકલનનો અચળાંક છે,તો:

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

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જો $\int \frac{1+\cos 8 x}{\tan 2 x-\cot 2 x} d x=f(x) \cdot \cos (g(x))+c$ હોય, તો $f\left(\frac{1}{4}\right)+g\left(\frac{1}{4}\right)=$

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