$z=\tan (y+a x)+\sqrt{y-a x} \Rightarrow z_{x x}-a^2 z_{y y}$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $z_x+z_y$
  • D
    $z_x z_y$

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