Re: Sqrt[Sin^2(x)]=Sin(x)....????
- To: mathgroup at smc.vnet.net
- Subject: [mg16340] Re: Sqrt[Sin^2(x)]=Sin(x)....????
- From: phbrf at t-online.de (Peter Breitfeld)
- Date: Sun, 7 Mar 1999 01:05:55 -0500
- Organization: das ist ein breites Feld ...
- References: <7bnr1r$dev@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Alessandro Agresti <agresti at fi.infn.it> schrieb:
>
> Can I get the following result:
> Sqrt[Sin^2(x)]=Sin(x) ???
> If so, how??
> Thanks You for Your BIG help.
> Alessandro Agresti
>
Alessandro,
Mathematica knows, that this isn't always true. But you can use
PowerExpand to get what you want:
In[1]= Sqrt[Sin[x]^2]//PowerExpand
Out[1]= Sin[x]
es gruesst
Peter
--
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Peter Breitfeld, Saulgau, Germany (PGP public key: 08548045)