[Maxima-discuss] rootscontract is changing the value of my expression.

[Herman J. <jar...@gm...>]

Here is the example:



(%i38) ztot;

(%o38) sqrt(50-2*5^(3/2))/5-sqrt(sqrt(5)-5)*sqrt(sqrt(5)-3)*(3*sqrt(5)+5)/20
(%i39) ev(ztot, numer);

(%o39) 1.902113032590307
(%i40) ztot1 :  rootscontract(ztot);

(%o40) sqrt(50-2*5^(3/2))/5-sqrt(20-8*sqrt(5))*(3*sqrt(5)+5)/20
(%i41) ev(ztot1, numer);

(%o41) .2008114158862273

Please observe that the value of "1.90..." was changed to ".2008"....
why is "rootscontract" changing the value of my expression? it should not
right?



Herman Jaramillo