બિંદુ $\theta = \pi / 2$ આગળ વક્ર $x = a(\theta - \sin \theta)$,$y = a(1 - \cos \theta)$ ના અભિલંબનો ઢાળ શું થાય?

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

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