If $\sin ^{-1} x+\sin ^{-1} \mathrm{y}+\sin ^{-1} \mathrm{z}=\frac{3 \pi}{2}, \quad$ then…

If $\sin ^{-1} x+\sin ^{-1} \mathrm{y}+\sin ^{-1} \mathrm{z}=\frac{3 \pi}{2}, \quad$ then $x^{100}+\mathrm{y}^{100}+\mathrm{z}^{100}=$
  1. $3$
  2. $4$
  3. $2$
  4. $1$

Solution

Given $\begin{array}{l} \sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2} \Rightarrow \sin ^{-1} x=\sin ^{-1} y=\sin ^{-1} z=\frac{\pi}{2} \\ \therefore x=y=z=1 \\ \therefore x^{100}+y^{100}+z^{100}=1+1+1=3 \end{array}$

Asked in: MHT CET 2020 (20 Oct Shift 1)

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