Evaluate the principal value of .

MATHEMATICS · Single correct · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions

Problem

Evaluate the principal value of

\cos^{-1}\left(-\dfrac{\sqrt{3}}{2}\right)

. (a)

\dfrac{2\pi}{3}

(b)

\dfrac{5\pi}{6}

(c)

\dfrac{7\pi}{6}

(d)

\dfrac{\pi}{6}

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