Tangent of Freeth's Nephroid

r = 1+2sin(t/2)

Reference : 

• E.H. Lockwood, A Book of Curves, pp. 134-135.

See Also : 

• Construct Freeth's Nephroid with the compass along.

• Tangent of Freeth's Nephroid.

• Osculating circle of Freeth's Nephroid.

Related Page :

• from MathWorld : http://mathworld.wolfram.com/FreethsNephroid.html

• Famous Curve Index : http://www-groups.dcs.st-and.ac.uk/~history/Curves/Freeths.html

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