Re: Simplifying certain trigonometric expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg121047] Re: Simplifying certain trigonometric expressions
- From: psycho_dad <s.nesseris at gmail.com>
- Date: Wed, 24 Aug 2011 07:51:32 -0400 (EDT)
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- References: <j328id$b4g$1@smc.vnet.net>
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Try this: Cos[2 ArcTan[y/x]] // TrigExpand // FullSimplify The result is: -1 + (2 x^2)/(x^2 + y^2) Cheers