यदि $x+iy = \frac{1+7i}{(2-i)^2}$ है,तो $\operatorname{cosec}\left(\tan^{-1} \frac{y}{x} - \frac{\pi}{4}\right) = $

  • A
    $1$
  • B
    $\infty$
  • C
    $-1$
  • D
    $0$

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