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How Expand?

• To: mathgroup at smc.vnet.net
• Subject: [mg127820] How Expand?
• From: "news" <news at newsfe13.iad.highwinds-media.com>
• Date: Fri, 24 Aug 2012 05:04:32 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: l-mathgroup@wolfram.com
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• Reply-to: "MedStat" <MedStat at shaw.ca>

Hi folks,

How can I expand the following :

[ 1 + cos(x) + i sin(x) ]^3

to obtain;

8 cos(x/2)^3 [cos(3x/2)+ i sin(3x/2)]

Thanks a lot.

Max.