मान ज्ञात कीजिए: $\cos ^{-1}\left(\frac{4}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)$

  • A
    $\cos ^{-1}\left(\frac{24}{25}\right)$
  • B
    $\cos ^{-1}\left(\frac{33}{65}\right)$
  • C
    $\cos ^{-1}\left(\frac{5}{13}\right)$
  • D
    $\cos ^{-1}\left(\frac{3}{5}\right)$

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यदि $\tan^{-1} (ax) + \tan^{-1} (3x) = \frac{\pi}{4}$, जहाँ $3ax^2 < 1$, तो $x = \frac{1}{6}$ के लिए $a$ का मान क्या है...

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