Possible Duplicate:
Can Reduce *really* not solve for x here?
Why can't Mathematica solve this equation?
f[x_] := Exp[Cos[3*x]]
g[x_] := (1/3)*x^3 - x^2 + 2
Solve[f[x] == g[x], x]
(* Solve::nsmet: This system cannot be solved with the methods available to Solve. >> *)
Solve[f[x] == g[x] && Abs[x] < 10, x, Reals]
. For more detailed discussion of transcendental equations see e.g. mathematica.stackexchange.com/questions/4694/…, a general issue ofRoot
see e.g. mathematica.stackexchange.com/questions/13767/… $\endgroup$x
to be real, but then the system might be unable to prove that there were all solutions found. AssumingReals
one gets5
solutions, while assumingComplex
one gets385
solutions. $\endgroup$