       Re: The derivative of 1

• To: mathgroup at smc.vnet.net
• Subject: [mg117429] Re: The derivative of 1
• From: Oliver Ruebenkoenig <ruebenko at wolfram.com>
• Date: Fri, 18 Mar 2011 06:00:40 -0500 (EST)

```On Thu, 17 Mar 2011, Themis Matsoukas wrote:

> How can I get rid of the inconsequential but bothersome "0." that appears at the beginning of the following result? We are really talking about the derivative of 1.
>
> D[(1 + (1 - Sqrt[x]) (1.574 \[Omega] - 0.176 \[Omega]^2)), x]
>
> 0.\[VeryThinSpace]- (1.574 \[Omega] - 0.176 \[Omega]^2)/(2 Sqrt[x])
>
> As an aside, why isn't 0.+whatever equal to whatever?
>
> Thanks
>
>

Hi,

you could convert every thing to exact arithmetic

D[(1 + (1 - Sqrt[x]) (Rationalize[1.574] \[Omega] -
Rationalize[0.176] \[Omega]^2)), x]

Alternative,

Chop[ D[(1 + (1 - Sqrt[x]) (1.574 \[Omega] - 0.176 \[Omega]^2)), x]]

hth,
Oliver

```

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