Which of the following graphs is symmetric about the -axis?

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

Problem

Which of the following graphs is symmetric about the

y

-axis? (a)

y = \tan x

(b)

y = \cos x

(c)

y = \sin x + \cos x

(d)

y = \sin x