જો $\tan \theta + \sec \theta = e^x$ હોય,તો $\cos \theta$ ની કિંમત શું થાય?

  • A
    $\frac{e^x + e^{-x}}{2}$
  • B
    $\frac{2}{e^x + e^{-x}}$
  • C
    $\frac{e^x - e^{-x}}{2}$
  • D
    $\frac{e^x - e^{-x}}{e^x + e^{-x}}$

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