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MathGroup Archive 1998

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Re: Sqrt Problems


  • To: mathgroup@smc.vnet.net
  • Subject: [mg12120] Re: Sqrt Problems
  • From: "Stephen P Luttrell" <luttrell@signal.dra.hmg.gb>
  • Date: Mon, 27 Apr 1998 01:46:06 -0400
  • Organization: Defence Evaluation and Research Agency
  • References: <6hpb0f$d3s@smc.vnet.net>

>Forgive me if this is a simple question, but I am trying to get  "1" out
>of the following expression and I can't seem to figure out how:
>
> u = Sqrt[a+I*b/a] * Sqrt[a^2+I*b] / Sqrt[a]
>...

I think you have your * and / swapped round.

Try the * and / the other way round, square the expression, and use
Simplify, as follows:

((Sqrt[a+I*b/a] / Sqrt[a^2+I*b] ) Sqrt[a])^2//Simplify

This gives the output

1

============================================================

Stephen P Luttrell
luttrell@signal.dra.hmg.gb
Adaptive Systems Theory                           01684-894046 (phone)
Room EX21, DERA                                    01684-894384 (fax)
Malvern, Worcs, WR14 3PS, U.K.
http://www.dra.hmg.gb/cis5pip/Welcome.html





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