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Re: Simplifying Sqrt[a^2*d^2]

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  • Subject: [mg8441] Re: Simplifying Sqrt[a^2*d^2]
  • From: Ersek_Ted%PAX1A at
  • Date: Sat, 30 Aug 1997 00:42:51 -0400
  • Sender: owner-wri-mathgroup at

>Carlos A. Felippa  wrote:
> I want Sqrt[a^2*d^2] to be automatically simplified to a*d
> wherever it appears in a very complex expression.
> In another system I simply declare a and d real nonnegative and let the
> program figure out the rest.  How do I do that in Mathematica?
> The obvious rule expr/.{Sqrt[a^2*d^2]->a*d}  does not work.

Use the following.

In[1]:=  PowerExpand[ Sqrt[a^2  d^2] ]

Out[2]=  a d

Of course this may not be true if   "a"  or  "d"  are Complex.

WRI discusses simplification problems like this at:

Ted Ersek

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