MathGroup Archive 1999

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Solve and Trig functions

  • To: mathgroup at
  • Subject: [mg19295] Solve and Trig functions
  • From: "Kevin J. McCann" <kevin.mccann at>
  • Date: Sat, 14 Aug 1999 01:45:18 -0400
  • Sender: owner-wri-mathgroup at

If I have the following two equations:

eq1 = a1 + b1 == Sin[fi];
eq2 = a2 + b2 == Cos[fi];

It is clear that

Tan[fi] == (a1+b1)/(a2+b2)

but how do I get Mathematica to recoginize this? This problem is trivial, but 
with more complicated expressions, the answer may not be immediately 



Kevin J. McCann
Johns Hopkins University APL

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