Some examples of Mathematica commands. 
4 Oct. 2004 
D.E. Soper; S. J. Remington

I^I

I^I //N

Exp[-Pi/2]

I^I /. a_^b_ :> Exp[b*Log[a]]

plot1 = Plot[Sin[x],{x,0,4},PlotStyle -> Hue[0.4]]

g = Series[Sin[x],{x,0,3}]

gg = Normal[g]

plot2 = Plot[gg,{x,0,4},PlotStyle -> Hue[0.8]]

Show[plot1,plot2]