यदि $\sec \theta - \tan \theta = \frac{a+1}{a-1}$ है,तो $\cos \theta =$

  • A
    $\frac{a^{2}+1}{a^{2}-1}$
  • B
    $\frac{a^{2}-1}{a^{2}+1}$
  • C
    $\frac{2a}{a^{2}+1}$
  • D
    $\frac{2a}{a^{2}-1}$

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