જો $\sum_{n=1}^k \tan ^{-1}\left(\frac{1}{n^2+3 n+3}\right)=\tan ^{-1} \alpha$ હોય, તો $\alpha=$

  • A
    $\frac{k}{k+2}$
  • B
    $\frac{2 k}{2 k+1}$
  • C
    $\frac{k}{2 k+5}$
  • D
    $\frac{3 k}{4 k+5}$

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Similar Questions

જો $\sin ^{-1}\left(\frac{3}{x}\right)+\sin ^{-1}\left(\frac{4}{x}\right)=\frac{\pi}{2}$ હોય, તો $x$ ની કિંમત શોધો.

જો $\sin \left(\sin ^{-1} \frac{1}{5}+\cos ^{-1} x\right)=1$ હોય,તો $x$ ની કિંમત શોધો.

વિધેયને તેના સરળ સ્વરૂપમાં લખો: $\tan ^{-1}\left(\frac{3 a^{2} x-x^{3}}{a^{3}-3 a x^{2}}\right), a>0 ; \frac{-a}{\sqrt{3}} \leq x \leq \frac{a}{\sqrt{3}}$

કિંમત શોધો: $\tan^{-1} \left( \frac{1 - x^2}{2x} \right) + \cos^{-1} \left( \frac{1 - x^2}{1 + x^2} \right)$

$\frac{d}{dx} \sin^{-1}(3x - 4x^3)$ ની કિંમત શોધો.

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