શ્રેણીનો સરવાળો શોધો: $\tan^{-1} \left( \frac{1}{1 + 1 \times 2} \right) + \tan^{-1} \left( \frac{1}{1 + 2 \times 3} \right) + \dots + \tan^{-1} \left( \frac{1}{1 + n(n + 1)} \right) =$

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

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જો $\cos ^{-1} x - \cos ^{-1} \frac{y}{3} = \alpha$,જ્યાં $-1 \leq x \leq 1$,$-3 \leq y \leq 3$,અને $x \leq \frac{y}{3}$ હોય,તો તમામ $x, y$ માટે $9x^2 - 6xy \cos \alpha + y^2$ ની કિંમત શું થાય?

જો $f(x) = \tan^{-1}\left\{ \frac{\log(e/x^2)}{\log(ex^2)} \right\} + \tan^{-1}\left( \frac{3 + 2\log x}{1 - 6\log x} \right)$ હોય,તો $\frac{d^n y}{dx^n}$ શું થાય? $(n \ge 1)$

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જો $2 \tan^{-1}(\cos x) = \tan^{-1}(2 \operatorname{cosec} x)$ હોય,તો $x$ ની કિંમત શોધો.

$\sin ^{-1} \frac{4}{5} + 2 \tan ^{-1} \frac{1}{3}$ ની કિંમત શોધો.

જો $0 \leq x \leq \frac{1}{2}$ હોય,તો $\tan \left[\sin ^{-1}\left\{\frac{x}{\sqrt{2}}+\frac{\sqrt{1-x^{2}}}{\sqrt{2}}\right\}-\sin ^{-1} x\right]$ ની કિંમત શોધો.

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