Bug in Calculus`DiracDelta`

*To*: mathgroup at smc.vnet.net*Subject*: [mg14768] Bug in Calculus`DiracDelta`*From*: "M. Rommel" <rommel at bc.edu>*Date*: Sat, 14 Nov 1998 03:07:59 -0500*Organization*: UltraNet Communications , an RCN Company http://www.ultranet.com/*Sender*: owner-wri-mathgroup at wolfram.com

I know normally "it's the user, stupid!" but this one seems real. In[1]:= <<Calculus`DiracDelta` In[2]:= Integrate[DiracDelta[Cos[x]],{x,0,\[Pi]}] Out[2]= 1 That's what I agree with but the next line I cannot: In[3]:= Integrate[DiracDelta[Cos[x]],{x,\[Pi],2\[Pi]}] Out[3]= 0 Any comments/insights/etc. pp.? Cheers, Martin.