જો $x, y, z$ એ $A.P.$ માં હોય અને $\tan ^{-1} x, \tan ^{-1} y, \tan ^{-1} z$ પણ $A.P.$ માં હોય,તો

  • A
    $x=y=z$
  • B
    $2x=3y=6z$
  • C
    $6x=3y=2z$
  • D
    $6x=4y=3z$

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જો ત્રિકોણ $ABC$ માં $\angle A = 90^\circ$ હોય,તો $\tan^{-1}\left(\frac{c}{a+b}\right) + \tan^{-1}\left(\frac{b}{a+c}\right) = $

$\sin ^{-1}(\cos(\sin ^{-1} x)) + \cos ^{-1}(\sin(\cos^{-1} x)) = \text{ . . . . . . }$

$2 \pi - \left(\sin ^{-1} \frac{4}{5} + \sin ^{-1} \frac{5}{13} + \sin ^{-1} \frac{16}{65}\right)$ ની કિંમત શોધો.

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