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Re: Simplify[ArcTan[Tan[a] + Tan[b]]]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120508] Re: Simplify[ArcTan[Tan[a] + Tan[b]]]
  • From: Jay Bee <jiri.bocan at gmail.com>
  • Date: Wed, 27 Jul 2011 06:10:42 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j0jk6s$ovj$1@smc.vnet.net>

Since
tg(a) + tg(b) = sin(a+b)/[cos(a)*cos(b)] = tg(a+b)*[1-tg(a)*tg(b)] =
[tg(a)*tg(b)]*[cotg(a) + cotg(b)]
maybe Mathematica is right...




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