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The domain of $f(x)=\cos^{-1}7x$ is: |
$\left[-\frac{1}{7},\frac{1}{7}\right]$ $[-7,7]$ $[ 0,7]$ $[-1, 1]$ |
$\left[-\frac{1}{7},\frac{1}{7}\right]$ |
The correct answer is Option (1) → $\left[-\frac{1}{7},\frac{1}{7}\right]$ Domain of $f(x)=\cos^{-1}x$ is $[-1,1]$ ∴ Domain of $\cos^{-1}7x$ = $\left[-\frac{1}{7},\frac{1}{7}\right]$ |
