Problem with Solve[]
- To: mathgroup at smc.vnet.net
- Subject: [mg20693] Problem with Solve[]
- From: Virgil Stokes <virgil.stokes at neuro.ki.se>
- Date: Sun, 7 Nov 1999 02:10:21 -0500
- Sender: owner-wri-mathgroup at wolfram.com
First, please reply to me directly since I am unable to get any email from the MathGroup (it appears that the MathGroup email is not being sent properly to my server). The problem that I have is this. Suppose I have the two transcendental equations: x == l1 Cos[A] + l2 Cos[A+B] y == l1 Sin[A] + l2 Sin[A+B] and I wish to solve for A,B. I am quite sure that one set of solutions is: A = ArcTan[y/x] - ArcTan[(l2 Sin[B]) / (l1+l2 Cos[B])] B = ArcCos[(x^2 + y^2 - l1^2 - l2^2) / ( 2 l1 l2)] This is a good solution for x,y > 0. But, with Mathematica 3.01 I have been unable to get this solution -- what is wrong? --V. Stokes