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MathGroup Archive 2004

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Re: Fundamental theorem problem

  • To: mathgroup at
  • Subject: [mg49600] Re: Fundamental theorem problem
  • From: "Steve Luttrell" <steve_usenet at>
  • Date: Sat, 24 Jul 2004 03:47:33 -0400 (EDT)
  • References: <cdqqnb$km6$>
  • Sender: owner-wri-mathgroup at

This does what you want:

FullSimplify[Assuming[2*x^4 <= Pi, D[Integrate[Sec[t], {t, 1, x^4}], x]]]

Steve Luttrell

"Steven Jonak" <jonakst at> wrote in message
news:cdqqnb$km6$1 at
> I input the command: D[Integrate[Sec[t],{t,1,x^4}],x] expecting to get
> 4x^3 Sec[x^4] but instead got a fairly complicated result that doesn't
> resemble what one would expect from the Fundamental Theorem of Calculus.
>  What am I doing wrong? Help!
> S Jonak
> "Maintain an even strain."

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