Re: TrigExpand - Odd behavior
- To: mathgroup at smc.vnet.net
- Subject: [mg55423] Re: TrigExpand - Odd behavior
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Wed, 23 Mar 2005 05:34:35 -0500 (EST)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
The unusual result that you obtain simplifies back to the original expression so it appears to be a legitimate representation. This represenation is probably due to Degree being in symbolic form. Use FunctionExpand to convert Degree to an exact numeric or manually convert Degree expr=Cos[x+45 Degree]; expr//FunctionExpand//TrigExpand//Factor (Cos[x] - Sin[x])/Sqrt[2] (expr/.Degree->Pi/180)//TrigExpand//Factor (Cos[x] - Sin[x])/Sqrt[2] %==expr // FullSimplify True Bob Hanlon > > From: "Bob Stagat" <stagat at linkline.com> To: mathgroup at smc.vnet.net > Date: 2005/03/22 Tue AM 03:51:07 EST > To: mathgroup at smc.vnet.net > Subject: [mg55423] TrigExpand - Odd behavior > > > Try executing the following three lines and explain the last result... > > Cos[45 Degree] > > Cos[x+45 Degree] > > Cos[x+45 Degree]//TrigExpand > > Thanks... > ~ BS ~ > >