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Inverse Tangent function

• To: mathgroup at smc.vnet.net
• Subject: [mg79970] Inverse Tangent function
• From: "Boen S. Liong" <mr_bean_curdy at yahoo.com>
• Date: Fri, 10 Aug 2007 01:38:13 -0400 (EDT)

Please help:

Let w1 = tan-1(x)  i.e. inverse tangent of x or tan(w1) = x

w2 = tan-1(y)  i.e. tan(y) = w2

and w3 = w2- w1

problem: find tan(w3) in term of x and y.

or better yet:

let x= x1/z1

and y= y1/z1

problem:find tan(w3) in term of x and y.

I know the formula for tan( u+v) or tan(u-v). but please help for the
above. thank you.

Boen S. Liong

• Follow-Ups:
  • Re: Inverse Tangent function
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • RE: Inverse Tangent function
    • From: "Jaccard Florian" <Florian.Jaccard@he-arc.ch>