$\int \frac{\sin x \cdot \cos x}{\sin ^{4} x+\cos ^{4} x} d x=$

  • A
    $\tan ^{-1}(\sin ^{2} x)+c$
  • B
    $2 \tan ^{-1}(\tan ^{2} x)+c$
  • C
    $\frac{1}{2} \tan ^{-1}(\tan ^{2} x)+c$
  • D
    $\tan ^{-1}(\cos ^{2} x)+c$

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Difficult
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જો $\int \frac{x^3 \, dx}{\sqrt{1+x^2}} = a(1+x^2) \sqrt{1+x^2} + b \sqrt{1+x^2} + c$ (જ્યાં $c$ એ સંકલનનો અચળાંક છે),તો $3ab$ ની કિંમત શોધો.

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