$\cot ^{-1}\left(\frac{-1}{\sqrt{3}}\right)$ નું મુખ્ય મૂલ્ય શોધો.

  • A
    $\frac{\pi}{3}$
  • B
    $\frac{2 \pi}{3}$
  • C
    $\frac{5 \pi}{6}$
  • D
    $\frac{\pi}{6}$

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જો $x = \tan^{-1} \left(\frac{1}{5}\right) + \tan^{-1} \left(\frac{1}{8}\right)$ હોય,તો $\frac{\sin x + \cos x}{\tan x} = $

$\sin ^{-1}\left(-\frac{1}{2}\right)+\cos ^{-1}\left(\frac{\sqrt{3}}{2}\right)=$ . . . . . . .

$\cot^{-1}\left(\frac{-1}{\sqrt{3}}\right)$ નું મુખ્ય મૂલ્ય . . . . . . ની બરાબર છે.

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