Mathematics for IGCSE & O level - Graphs Of Functions (Section 1 - No. 43)
If the graph of a function is symmetrical about the y-axis, which of the following must be true?
The function is even.
The function is odd.
The function is neither even nor odd.
The function is a linear function.
คำอธิบาย
A function symmetrical about the y-axis is an even function.