જો $\sin (x+y)+\cos (x+y)=\sin \left[\cos ^{-1}\left(\frac{1}{3}\right)\right]$ હોય,તો $\frac{d y}{d x}=$

  • A
    $\frac{1}{2}$
  • B
    -$1$
  • C
    $1$
  • D
    $0$

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