જો $\tan^{-1} x + \tan^{-1} y = \frac{\pi}{4}$ હોય,તો:

  • A
    $x + y - xy = 1$
  • B
    $x + y + xy = 1$
  • C
    $x + y + xy + 1 = 0$
  • D
    $x + y - xy + 1 = 0$

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કિંમત શોધો: $\cos ^{-1}\left(\frac{4}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)$

જો $x$ ઋણ શક્ય કિંમત ધારણ કરે,તો $\sin^{-1} x$ બરાબર શું થાય?

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