Given $0 \leq x \leq \frac{1}{2}$, then the value of $\tan \left(\sin…

Given $0 \leq x \leq \frac{1}{2}$, then the value of $\tan \left(\sin ^{-1}\left(\frac{x}{\sqrt{2}}+\frac{\sqrt{1-x^2}}{\sqrt{2}}\right)-\sin ^{-1} x\right)$ is
  1. $1$
  2. $\sqrt 3$
  3. $-1$
  4. $\frac{1}{\sqrt{3}}$

Solution

$\begin{aligned} & \tan \left[\sin ^{-1}\left(\frac{x}{\sqrt{2}}+\frac{\sqrt{1-x^2}}{\sqrt{2}}\right)-\sin ^{-1} x\right] \\ & =\tan \left[\sin ^{-1}\left(\frac{x+\sqrt{1-x^2}}{\sqrt{2}}\right)-\sin ^{-1} x\right] \\ & =\tan \left[\sin ^{-1}\left(\frac{\sin \theta+\cos \theta}{\sqrt{2}}\right)-\theta\right] \quad \ldots\left[\begin{array}{l}\text { Put } \sin ^{-1} x=\theta \\ \Rightarrow x=\sin \theta\end{array}\right] \\ & =\tan \left[\sin ^{-1}\left[\sin \left(\theta+\frac{\pi}{4}\right)\right]-\theta\right] \\ & =\tan \left(\theta+\frac{\pi}{4}-\theta\right) \\ & =\tan \frac{\pi}{4}=1\end{aligned}$

Asked in: MHT CET 2023 (14 May Shift 2)

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