"Suspension bridges span distances longer than other kinds of bridges. Huge cables suspend the roadway of a suspension bridge. A cable suspended between two points forms a catenary curve defined by the formula, y = (ex + e-x)/2. What type of symmetry does the catenary curve have? (Hint: Graph it on your calculator.)"

Question

"Suspension bridges span distances longer than other kinds of bridges. Huge cables suspend the roadway of a suspension bridge. A cable suspended between two points forms a catenary curve defined by the formula, y = (ex + e-x)/2.  What type of symmetry does the catenary curve have? (Hint: Graph it on your calculator.)"

anonymous · Answer

I graphed it in my calculator, and i see what it looks like. 
The thing is, i don't know what "polar symmetry" is, and that's one of the options.