Simultaneous equation solve taking ages

*To*: mathgroup at smc.vnet.net*Subject*: [mg114346] Simultaneous equation solve taking ages*From*: Peter Bone <peterbone at gmail.com>*Date*: Wed, 1 Dec 2010 02:15:01 -0500 (EST)

I'm trying to execute this solve. I ran it for 5 hours and it hasn't finished yet. Will this ever finish? Why is it taking so long? Solve[a^2 == d^2 + f^2 - 2*d*f*x && b^2 == e^2 + f^2 - 2*e*f*y && c^2 == d^2 + e^2 - 2*d*e*z, {d, e, f}] I haven't used Mathematica much before so I'm not sure I've done it correctly. This is for a geometrical problem involving 3 cosine rule equations. a, b, c, x, y, z are known. Trying to find d, e, f in terms of the knowns. Pete