यदि $\tan ^{-1}\left[\frac{1}{1+1 \cdot 2}\right]+\tan ^{-1}\left[\frac{1}{1+2 \cdot 3}\right]+\cdots+\tan ^{-1}\left[\frac{1}{1+n(n+1)}\right]=\tan ^{-1}[x]$ है,तो $x=$

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

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यदि $\sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2}$ है,तो $x^{100}+y^{100}+z^{100}=$

यदि $\sin \left(\sin ^{-1} \frac{1}{5}+\cos ^{-1} x\right)=1$ है,तो $x$ का मान है

$\tan ^{-1} 2+\tan ^{-1} 3=$

निम्नलिखित कथनों पर विचार करें:
अभिकथन $(A)$: $x \in \mathbb{R}-\{1\}$ के लिए,$\frac{d}{dx}\left(\tan^{-1}\left(\frac{1+x}{1-x}\right)\right) = \frac{d}{dx}\left(\tan^{-1} x\right)$.
तर्क $(R)$: $x < 1$ के लिए,$\tan^{-1}\left(\frac{1+x}{1-x}\right) = \frac{\pi}{4} + \tan^{-1} x$,और $x > 1$ के लिए,$\tan^{-1}\left(\frac{1+x}{1-x}\right) = -\frac{3\pi}{4} + \tan^{-1} x$.
सही उत्तर है:

यदि $\sin ^{-1}\left(\frac{3}{x}\right)+\sin ^{-1}\left(\frac{4}{x}\right)=\frac{\pi}{2}$ है,तो $x$ का मान ज्ञात कीजिए।

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