જો $x \sin (\alpha+y)=\sin y$ અને $y=\frac{m}{x^2+2 n x+1}$ હોય,તો $m^2=$

  • A
    $1-n^2$
  • B
    $1+n$
  • C
    $1-n$
  • D
    $n^2-1$

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