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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)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j328id$b4g$1@smc.vnet.net>
  • Reply-to: comp.soft-sys.math.mathematica at googlegroups.com

Try this:
Cos[2 ArcTan[y/x]] // TrigExpand // FullSimplify
The result is:
-1 + (2 x^2)/(x^2 + y^2)

Cheers




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