Question: Where can I find help for dsolve, parametric?

dsolve(f(x,y),y(x),parametric) in Maple 9.5 outputs an expression for y(_T) and for x(_T).

(from the book "Computer Algebra Recipes for Mathematical Physics by Richard H. Enns, section 7.1.1, finding the parametric equation of the brachistochrone)

but the same command in Maple 2016 outputs an expression for y(x) only.

Why do Maple 9.5 and Maple 2016 produce different output?

Where can I find a help page explaining or giving examples of dsolve, parametric?

 

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