The evolute of the prolate cycloid
| 
(1)
 | |||
| 
(2)
 | 
(with )
 is given by
| 
(3)
 | |||
| 
(4)
 | 
 
	    
	
    
Weisstein, Eric W. "Prolate Cycloid Evolute." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ProlateCycloidEvolute.html