       Question : How to force ( Exp[I x]/2+Exp[-I x]/2=cos(x) ) ?

• To: mathgroup at smc.vnet.net
• Subject: [mg3402] Question : How to force ( Exp[I x]/2+Exp[-I x]/2=cos(x) ) ?
• From: yjtsai at leland.Stanford.EDU (Yeou-Jyh Tsai)
• Date: Mon, 4 Mar 1996 02:34:33 -0500
• Organization: Stanford University
• Sender: owner-wri-mathgroup at wolfram.com

```Hello,

I use Mathematica's MatrixExp to generate the symbolic form of
a matrix's exponential. It gives me lots of
I x     -I x          -I x      I x
E      E            I E        IE
---   + ------ and  -------- - -----
2	   2		2	 2
which should be converted to Cos[x] and Sin[x], respectively. Does anyone
know how to do this ?

Thanks a lot!

Yeou-Jyh Tsai
tsai at relgyro.stanford.edu

==== [MESSAGE SEPARATOR] ====

```

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