Asked by Kiki

If 0 ≤ x ≤ 2π, which equation is a line of symmetry for the graph of y = cos x?

x = 0
x = 2π
x = π
y = 0
Answered by Jackie
y = 0

The graph of y = cos x is symmetrical about the y axis.
Answered by Steve
y=0 is not the y-axis.

And anyway, in the stated domain, x=pi is the axis of symmetry.

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