જો $y = \tan^{-1}\left(\frac{1}{x^2 + x + 1}\right) + \tan^{-1}\left(\frac{1}{x^2 + 3x + 3}\right) + \tan^{-1}\left(\frac{1}{x^2 + 5x + 7}\right) + \dots$ $n$ પદો સુધી હોય,તો $\frac{dy}{dx}$ ની કિંમત શોધો.

  • A
    $\frac{1}{1 + (x + n)^2} - \frac{1}{1 + x^2}$
  • B
    $\frac{1}{1 + (x + n)^2} + \frac{1}{1 + x^2}$
  • C
    $\frac{1}{1 + (x + n)^2} - \frac{1}{1 + (x + n - 1)^2}$
  • D
    $\frac{1}{1 + (x + n)^2} + \frac{1}{1 + (x + n - 1)^2}$

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$\cot \left(\operatorname{cosec}^{-1} \frac{5}{3}+\tan ^{-1} \frac{2}{3}\right)$ નું મૂલ્ય શોધો.

જો $0 < x < \frac{1}{\sqrt{2}}$ અને $\frac{\sin ^{-1} x}{\alpha}=\frac{\cos ^{-1} x}{\beta}$ હોય,તો $\sin \left(\frac{2 \pi \alpha}{\alpha+\beta}\right)$ ની કિંમત $......$ છે.

$\begin{aligned} & \text{જો } \cot \left(\cos ^{-1} x\right)=\sec \left\{\tan ^{-1}\left(\frac{a}{\sqrt{b^2-a^2}}\right)\right\} \\ & b>a, \text{ હોય તો } x= \end{aligned}$

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

$\frac{d}{dx}(\sin^{-1}(3x - 4x^3)) = $

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