You can play with the constants on the graph Ive created at Desmos. Cosx cos400 x x 04 4 x x01 cos x cos 400 x x - 04 4 - x x 01. The following are other equations which also give heart shapes.
Admittedly cardioids generated by equations look far more like apple halves than valentine hearts.
Integral with adjustable bounds. Especially graphing linear equations which will be the focus of this unit. These types of equations are called parametric equations. Y 2 x 2 1 3 x 2 y 3 0.