સરવાળો $\sum\limits_{n = 1}^\infty {{\cot }^{ - 1}} \left( {\frac{{2\left( {\sum\limits_{k = 1}^n k } \right) - 1}}{3}} \right)$ ની કિંમત શોધો.

  • A
    $\frac{3\pi}{4} + \cot^{-1} 2$
  • B
    $\frac{\pi}{2} + \cot^{-1} 3$
  • C
    $\pi$
  • D
    $\frac{\pi}{2} + \tan^{-1} 2$

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અસમતા $(\sec^{-1}x - 4)(\sec^{-1}x - 1)(\sec^{-1}x - 2) \ge 0$ નો સંપૂર્ણ ઉકેલ ગણ શોધો.

$x = 0$ આગળ $\frac{d}{dx} \tan^{-1} \left[ \frac{3a^2x - x^3}{a(a^2 - 3x^2)} \right]$ નું મૂલ્ય શોધો.

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