Question

How do you graph `r=2(1-sin(theta))`?

Answer 1

See the cardioid in the inserted graph.

Explanation:

graph{x^2+y^2-2sqrt(x^2+y^2)+2y=0 [-10, 10, -5, 5]}

The genera equation of the cardioid is

`r=a(1+cos(theta-alpha))`, with cusp at the pole and axis of

symmetry, along the radial line `theta=alpha`

Here a = 2 and `alpha = -pi/2`.