यदि दो वक्र $y=a^x$ और $y=b^x$ एक कोण $\alpha$ पर प्रतिच्छेद करते हैं,तो $\tan \alpha=$

  • 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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