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MathGroup Archive 2004

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Re: Limit problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51127] Re: Limit problem
  • From: "Matthew Senn" <msenn at chaotic_nospam_delusions.com>
  • Date: Tue, 5 Oct 2004 04:37:19 -0400 (EDT)
  • References: <cjr9ce$osq$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Here is what I get running version 4.2.0.0

In[13]:=
f[x_]:=Sin[12*x^2]/(3*x^2)

In[14]:=
Limit[(f[0.4 + h] - f[0.4])/h, h -> 0]

Out[14]=
-16.631

In[15]:=
f'[0.4]

Out[15]=
-16.631




"Mike Zeitzew" <pdop at yahoo.com> wrote in message 
news:cjr9ce$osq$1 at smc.vnet.net...
> Why is Limit giving me the wrong answer for this simple divided 
> difference?   I am using 5.0.1.0 /
> XP
>
> In[1]:=
> Clear[f,h,x]
>
> In[2]:=
> f[x_]:=Sin[12*x^2]/(3*x^2)
>
> In[3]:= Limit[(f[0.4 + h] - f[0.4])/h, h -> 0]
>
> Out[3]=
> -&#8734;
>
> In[4]:=
> f'[0.4]
>
> Out[4]=
> -16.631
> 



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