The following command in W|A returns invalid limits:
revolve f(x)=a/2(e^(x/a) + e^(-x/a)), x = 1 to b, around the x-axis
How can I solve this problem?
Dear Rosa,
where to you enter that? Wolfram|Alpha? Mathematica.
I guess that it says that the limits are invalid, because the upper limit of x is b and that is for a plot, which involves numerical evaluation, invalid.
I would suggest you use in Mathematica
RevolutionPlot3D[a/2 (Exp[x/a] + Exp[-x/a]) /. a -> 2, {x, 1, 5}]
If you don’t have Mathematica you can use the free account of the development platform or the programming lab. I guess that the Raspberry Pi version can do that, too. Note that I “corrected” the Exp function and substituted values for a and b.
Wolfram|Alpha will not interpret that syntax correctly though.
Cheers,
Marco
Hi Maco,
Thank you very much for giving solution to my problem. It was quite quick to respond