$y=\int \cos \left\{2 \tan ^{-1} \sqrt{\frac{1-x}{1+x}}\right\} d x$ किसका समीकरण है?

  • A
    सरल रेखाएं
  • B
    वृत्त
  • C
    दीर्घवृत्त
  • D
    परवलय

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