Re: solving for 2 angles

*To*: mathgroup at smc.vnet.net*Subject*: [mg89817] Re: solving for 2 angles*From*: Steven Siew <stevensiew2 at gmail.com>*Date*: Sat, 21 Jun 2008 05:31:40 -0400 (EDT)*References*: <g3g00h$kvd$1@smc.vnet.net>

I dont know what you are trying to find but you should first get rid of Sin and Cosine by turning them into exponential functions. eqn01 = J*Cos[az]*Sin[el] + K*Sin[az]*Sin[el] + L*Cos[el] == 0 eqn02 = M*Cos[az]*Sin[el] + N*Sin[az]*Sin[el] + P*Cos[el] == 0 eqn03 = TrigToExp[eqn01] eqn04 = TrigToExp[eqn02] soln01 = Solve[eqn03, el] eqn05 = eqn04 /. soln01 finalsolution=Solve[eqn05, az] It's much better if you put in all your assumptions at the very start with the form $Assumptions = And @@ {x > 0, y > 0, z > 0} Steven Siew