AM-2715

Principal values

A Math · Secondary 4 · Easy · Principal values

State the range of the principal values of

\cos^{-1}x

in radians.

$0\le y\le \pi$
$-\dfrac{\pi}{2}\le y\le \dfrac{\pi}{2}$
$0< y<2\pi$
$-\pi< y<\pi$

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