The correct option is c. its graph is symmetric about y axis.
What are trigonometric equations?
These are the equation that contains trigonometric operators such as sin, cos.. etc.. In algebraic operation.
According to the given data
cosine function have symmetric properties about y Axis
and every function
A y = –cos(x); B y = –sin(x) ; C y = cos(x) ; D y = sin(x)
all of them represents the graph.
Thus, correct option is c. its graph is symmetric about y axis.
Learn more about trigonometry equations here:
brainly.com/question/22624805
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