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...