यदि $\int \frac{\sin \left(x-\frac{\pi}{4}\right)}{2+\sin 2 x} d x=-\frac{1}{\sqrt{2}} \tan ^{-1}(f(x))+C$ है,तो $f(x)=$

  • A
    $\sin x-\cos x$
  • B
    $\sqrt{2} \cos \left(x-\frac{\pi}{4}\right)$
  • C
    $\sin \left(x-\frac{\pi}{4}\right)$
  • D
    $\sqrt{2} \tan \left(x-\frac{\pi}{4}\right)$

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$\int \frac{x^2}{1+x^6} d x$ का मान क्या है?

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