SetDelayed

*To*: mathgroup at smc.vnet.net*Subject*: [mg92875] SetDelayed*From*: Itzhak <shechtma at netvision.net.il>*Date*: Thu, 16 Oct 2008 05:06:07 -0400 (EDT)

Why does Mathematica reply with: .."Integrand [(x-Cos[y])/(1+x^2-2*x*Cos[y])^1.5 is not numerical at {y}={1.5708}", to the following: Clear[f] f[x_]:=NIntegrate[(x-Cos[y])/(1+x^2-2*x*Cos[y])^1.5,{y,0,Pi}]; Plot[Evaluate[f[x],{x,0,2}] How should it be written? Thank you.