यदि $\cos ^{-1}\left(\frac{y}{b}\right)=n \log \left(\frac{x}{n}\right)$ है,तो

  • A
    $x y_{1}=n \sqrt{b^{2}-y^{2}}$
  • B
    $x y_{1}+n \sqrt{b^{2}-y^{2}}=0$
  • C
    $y_{1}=x \sqrt{b^{2}-y^{2}}$
  • D
    $x y_{1}-\sqrt{b^{2}-y^{2}}=0$

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