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KISS CURVE

Homemade name. It can be made more precise: puckering, duckface! |

Cartesian parametrization:
.
Cartesian equation: . Rational sextic. |

The rotation of this curve around Oz combined
with a scaling of factor 1/2 in the direction Oz yields a flying
saucer.
Parametrization: |

See also the
mouth and the heart.

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© Robert FERRÉOL
2017