Question
an equation is being tested for symmetry with respect to the x-axis, the y-axis, and the origin. explain why, if two of these symmetries are present then remaining one must also be present.
Answers
For x-axis reflection symmetry,
f(x,y) = f(x,-y)
For y-axis reflection symmetry,
f(x,y) = f(-x,y)
For symmetry about the origin,
f(x,y) = f(-x,-y)
If you reflect about both x and y axes, it is equivalent to reflecting about the origin.
If you reflect about the origin and then one axis, you have reflected about the other axis.
f(x,y) = f(x,-y)
For y-axis reflection symmetry,
f(x,y) = f(-x,y)
For symmetry about the origin,
f(x,y) = f(-x,-y)
If you reflect about both x and y axes, it is equivalent to reflecting about the origin.
If you reflect about the origin and then one axis, you have reflected about the other axis.
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