MathGroup Archive: March 1996 [00247]

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

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Subject: [mg3429] Re: [mg3402] Question : How to force ( Exp[I x]/2+Exp[-I x]/2=cos(x)
From: Allan Hayes <hay at haystack.demon.co.uk>
Date: Wed, 6 Mar 1996 01:48:02 -0500
Sender: owner-wri-mathgroup at wolfram.com

yjtsai at leland.Stanford.EDU (Yeou-Jyh Tsai)
[mg3402] Question : How to force ( Exp[I x]/2+Exp[-I x]/2=cos(x) ) ?

Tsai:

<<Algebra`Trigonometry`

(Exp[I x]/2 +Exp[-I x]/2)//ComplexToTrig//Simplify

	Cos[x]

Allan Hayes
hay at haystack.demon.co.uk

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