Cusp
Cusp (Spinode is an alternative name) is a singular point of a curve.
A classic example of a curve that exhibits a Cusp is the curve defined by equations:

To draw curve use the folowing script:
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# Example |
Cusp (Spinode is an alternative name) is a singular point of a curve.
A classic example of a curve that exhibits a Cusp is the curve defined by equations:

To draw curve use the folowing script:
|
# Example |