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Re: Some assistance from seasoned users.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124928] Re: Some assistance from seasoned users.
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Sun, 12 Feb 2012 05:05:31 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201202111135.GAA16372@smc.vnet.net>

Judging from your question, perhaps you are using the wrong syntax


Integrate[Sin[x]^3/x, {x, 0, Infinity}]

Pi/4


Integrate[Sin[x]^3/x^3, {x, 0, Infinity}]

(3*Pi)/8


Bob Hanlon

On Sat, Feb 11, 2012 at 6:35 AM, peter livingston
<peter.livingston at cox.net> wrote:
> Folks!
>
>
>
> I have recently come to the pleasures of Mathematica from other popular but
> very expensive programming methods that I, as a retiree, cannot afford.
>
>
>
> My specific question is this: why am I able to get Mathematica to do the
> complete integral of sin(x)/x, but it refuses to do any of the other types:
> specifically sin^3[x]/x or sin^3[x]/x^3 over the half interval from zero to
> infinity. (see page 449 of G & R  Table of Integrals).
>
>
>
> It seems to suggest that throwing away my Gradshtein and Ryzhik is premature
> in spite of the claims in the Mathematica "Mathematics and Algorithms"
> manual.
>
>
>
> Peter Livingston



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