$\cot \left( \sum\limits_{r = 1}^\infty \tan^{-1} \left( \frac{4}{4r^2 + 3} \right) \right)$ નું મૂલ્ય કેટલું થાય?

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $2$
  • D
    $\frac{1}{4}$

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જો કોઈ $x \in (-1, 1)$ માટે $\sin^{-1} x = \frac{\pi}{5}$ હોય,તો $\cos^{-1} x$ ની કિંમત શોધો.

જો $x \in \left(0, \frac{1}{4}\right)$ માટે,$\tan^{-1}\left(\frac{6x\sqrt{x}}{1-9x^3}\right)$ નું વિકલન $\sqrt{x} \cdot g(x)$ હોય,તો $g(x)$ ની કિંમત શોધો.

$\tan ^{-1} \frac{3}{4} + \tan ^{-1} \frac{3}{5} - \tan ^{-1} \frac{8}{19} = $

સાબિત કરો કે $2 \tan ^{-1} \frac{1}{2} + \tan ^{-1} \frac{1}{7} = \tan ^{-1} \frac{31}{17}$.

$\cos ^{ - 1}\left( \frac{3 + 5\cos x}{5 + 3\cos x} \right)$ ની કિંમત શું થાય?

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