Integrate?

*To*: <mathgroup at yoda.ncsa.uiuc.edu>*Subject*: Integrate?*From*: Harald Hanche-Olsen <hanche at imf.unit.no>*Date*: Fri, 2 Nov 90 18:21:48 +0100

Robert Staerk <staerk at iam.unibe.ch> writes ... Mathematica gives a wrong answer to the following integral: 2 Pi / | 1/2 | (2 - 2 cos(x)) dx | / 0 Is this a known bug? In[1]:= Integrate[ Sqrt[2 - 2 Cos[x]], {x, 0, 2 Pi}] Out[1]= 0 This is apparently caused by Mathematicas attempts at being clever about things like complex square roots, branch cuts and the like. Yes, it is known. And some people think Mathematica is brain-dead because of it. Myself, I haven't decided yet. I keep alternating between Mathematica and Maple, just like you seem to do... - Harald Hanche-Olsen <hanche at imf.unit.no> Division of Mathematical Sciences The Norwegian Institute of Technology N-7034 Trondheim, NORWAY