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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