Question

interactive task
what type of symmetry does
cosine have?
even
odd
no symmetry

Explanation:

A function has even symmetry if its graph is symmetric about the y-axis, meaning $f(-x) = f(x)$ for all $x$ in the domain. The cosine function satisfies $\cos(-x) = \cos(x)$, and its graph (shown) is mirrored across the y-axis.

Answer:

Even