Question

How do you graph r^2=cos(2theta)
This is a polar graph and I am so confused

Answer 1

http://www.wolframalpha.com/input/?i=polarplot+r^2%3Dcos%282theta%29

Answer 2

I know what it looks like, I just want to understand how to get there

Answer 3

just give values for theta to find r

Answer 4

\(r= \pm\sqrt{cos\theta}\), right?

Answer 5

The r^2 is confusing me.

Answer 6

if theta =0, then \(r=\pm 1\)

Answer 7

Oh okay, so it really is the same as if you just had r, except you have a + and a - value for each one?

Answer 8

yup

Answer 9

Awesome! Thank you so much :)

Answer 10

np