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Solve or Reduce?
I'm looking to solve the equation (13 Cos[q]-(5+8 Cos[f]))^2+(13 Sin[q]-(7+8 Sin[f]))^2?49 so that I can graph phi as a function of theta in the first quadrant only. A graph of the solution obtained using the Solve command produces unexpected results and I haven't used Mathematica much so I'm having trouble intrepreting the results that the Reduce operation produces. I understand that the solution is periodic but can someone interpret what the other symbols in the solution mean, e.g., C, &&, || etc.?