Which of the following lists contains all -values in the interval at which attains…

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

Problem

Which of the following lists contains all

x

-values in the interval

[-2\pi,\pi]

at which

y=\cos x

attains its maximum? (a)

-2\pi,\;-\pi,\;0

(b)

-\dfrac{3\pi}{2},\;\dfrac{\pi}{2}

(c)

-2\pi,\;0

(d)

-\pi,\;0,\;\pi