જો બે વક્રો $y=a^x$ અને $y=b^x$ એ $\alpha$ ખૂણે છેદતા હોય,તો $\tan \alpha=$

  • A
    $\frac{\log a-\log b}{1+\log a \log b}$
  • B
    $\frac{\log a+\log b}{1-\log a \log b}$
  • C
    $\frac{\pi}{4}$
  • D
    $\frac{\pi}{2}$

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