Petr Lobaz

Mostly the same applies in this case (no abs_integrate package): (%i1) integrate(sqrt(1-cos(x)^2), x, 0, %pi/2); (%o1) -1 Indeed, the equivalent formula gives the correct result: (%i2) integrate(sin(x), x, 0, %pi/2); (%o2) 1 The bug is present in Maxima 5.42.2, 5.42.1, 5.41.0a (at least). wxMaxima version: 19.01.2x using wxWidgets version: wxWidgets 3.1.0 Maxima version: 5.42.2 Maxima build date: 2019-01-25 00:03:20 Host type: x86_64-w64-mingw32 System type: gcc -mno-cygwin -g -O2 -W -Wswitch -Wcomment...