to_poly_solve: to_poly_solver.mac is obsolete; I'm loading to_poly_solve.mac instead.
But I think that the first solution should be (based on hand solving): (4*%pi*%z0+%pi)/4 (no minus sign).
For example: if we consider %z0 = 0 in the to_poly_solve solution, we get x=-%pi/4 which is not a solution of the equation cos(x)-sin(3*x). On the other hand, if we set %z0 = 0 in the hand found solution, we get x=%pi/4 which is a solution.
The build_info is: build_info("5.27.0","2012-05-08 11:27:57","i686-pc-mingw32","GNU Common Lisp (GCL)","GCL 2.6.8").
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