<div id="comment:0"></div> ``` sage: assume(x>0) sage: sin(pi*x) 0 ``` This is fixed in Pynac git master and will be in pynac-0.6.5. Depends on #20475 CC: @egourgoulhon Component: **symbolics** _Issue created by migration from https://trac.sagemath.org/ticket/20456_