यदि $\int \frac{x^4+1}{x^6+1} dx = A \tan^{-1} x + B \tan^{-1} x^3 + c$ है, तो $(A, B) =$

  • A
    $\left(1, \frac{1}{3}\right)$
  • B
    $\left(1, \frac{1}{4}\right)$
  • C
    $\left(1, \frac{1}{6}\right)$
  • D
    $\left(1, \frac{4}{3}\right)$

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यदि $\int \frac{d x}{3-2 \cos 2 x}=\frac{\tan ^{-1}(f(x))}{\sqrt{5}}+c$,(जहाँ $c$ समाकलन का स्थिरांक है),तो $f(\pi / 4)$ का मान ज्ञात कीजिए:

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