; Graph of cardioid, a heart-shaped curve.
; Example of parametric plot

r(t) := 2 (COS(t) + 1)        ; equation in polar coords
x(t) := r(t) COS(t)           ; polar to rectangular conversion
y(t) := r(t) SIN(t)

PLOT y
XAXIS x
GBOUNDS 0, 2 PI