MCQ
Choose the correct answer from the given four options.The domain of the function defined by $\text{f}(\text{x})=\sin^{-1}\sqrt{\text{x}-1}$ is:
  • $[1, 2]$
  • B
    $[-1, 1]$
  • C
    $[0, 1]$
  • D
    none of these.

Answer

Correct option: A.
$[1, 2]$
$\text{f}(\text{x})=\sin^{-1}\sqrt{\text{x}-1}$
$\Rightarrow\ 0\leq\text{x}-1\leq1\ [\because\ \sqrt{\text{x}-1}\geq0$ and $-1\leq\sqrt{\text{x}-1}\leq1]$
$\Rightarrow\ 1\leq\text{x}\leq2$
$\therefore\ \text{x}\in[1,2]$

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