Question

what does it take for a graph to be symmetrical about the x axis?

Answer 1

If you have an equation like this \[x =y ^{2}\]You will you get symmetry about the x axis.

Answer 2

polar relates to cos , for sure also.

Answer 3

If you have done inverse functions, then
\(f^{-1}(x)=f^{-1}(-x)\) will mean f(x) is symmetrical about the y-axis.
Perhaps there are simpler ways to express the same idea.

Answer 4

doesnt
sine theta works too?