looking for graphing app/software which can graph this equation

Question

I have an equation which makes a spiral that I want to print but none of the apps/sites I tried generate enough spiral curves. I want at least 11 curves.

I already tried desmos.com and mathstud.io - desmos stops at around 8 curves. The equation is image-link

$$r=a.\theta^2-1+b.\theta$$

Answer 1

You can use Graphing Calculator 3D to accomplish this.

First, type down your equation and variables like this:

a=0.001
b=1
r=a*θ^2-1+b*θ

Then, change the default range of θ to go from 0 to 16pi.

Here is the result I got: