Question
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
x = 0
x = 2π
x = π
y = 0
Answers
Jackie
y = 0
The graph of y = cos x is symmetrical about the y axis.
The graph of y = cos x is symmetrical about the y axis.
Steve
y=0 is not the y-axis.
And anyway, in the stated domain, x=pi is the axis of symmetry.
And anyway, in the stated domain, x=pi is the axis of symmetry.