FADHIL MARSANI написал(а):
unfortunately, i cant get the same answer. can you give your file? LucMeekes
Luc has Mathcad 11 with other symbolic engine.
P.S. Note that Mathcad 11 (symbolic engine: Maple) will give generally a single answer, even if multiple/periodic answers exist.
The example of Valery shows that Mathcad 15 (symbolic engine: Mupad) may give the multiple/periodic answer to such problems.