Mathematics

Problem

## EXERCISE 2.2 13.

\cos ^{-1}\left(\cos \frac{7 \pi}{6}\right)

is equal to (A)

\frac{7 \pi}{6}

(B)

\frac{5 \pi}{6}

(C)

\frac{\pi}{3}

(D)

\frac{\pi}{6}

(A)

\frac{7 \pi}{6}

(B)

\frac{5 \pi}{6}

(C)

\frac{\pi}{3}

(D)

\frac{\pi}{6}