यदि $x = \sec \phi - \tan \phi$ और $y = \csc \phi + \cot \phi$ है,तो:

  • A
    $xy + x - y + 1 = 0$
  • B
    $y = \frac{1 + x}{1 - x}$
  • C
    $x = \frac{y - 1}{y + 1}$
  • D
    उपरोक्त सभी

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