The value of the expression $1 - \frac{{{{\sin }^2}y}}{{1 + \cos \,y}} + \frac{{1 + \cos \,y}}{{\sin \,y}} - \frac{{\sin \,\,y}}{{1 - \cos \,y}}$ is equal to

  • A

    $0$

  • B

    $1$

  • C

    $\sin \,y$

  • D

    $\cos \,y$

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  • [JEE MAIN 2021]