Question

Determine if the graph is symmetric about the x-axis, the y-axis, or the origin.

r = 3 cos 5θ

Answer 1

cosine function is an even function. which means that F(-x)=F(x). so it is symmetric about y-axis

Answer 2

I don't think so. To me it's a polar function and since it's cos function, it is symmetric about the x -axis . Here is your graph https://www.desmos.com/calculator

Answer 3

i saw y=3cos(5x) my bad :D

Answer 4

ok, everyone makes mistake, friend