With reference to the principal values, if $\sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2}$, then…

With reference to the principal values, if $\sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2}$, then $x^{100}+y^{100}+z^{100}=$
  1. 2
  2. 3
  3. 1
  4. 6

Solution

$\begin{aligned} & \sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2}=\frac{\pi}{2}+\frac{\pi}{2}+\frac{\pi}{2}=\sin ^{-1}(1)+\sin ^{-1}(1)+\sin ^{-1}(1) \\ & \Rightarrow x=y=z=1 \\ & \Rightarrow x^{100}+y^{100}+z^{100}=1^{100}+1^{100}+1^{100}=3\end{aligned}$

Asked in: MHT CET 2022 (07 Aug Shift 1)

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