That is neither an inequality nor an identity. WolframAlpha
Now, if you want to know for what values of you have , that is solvable, but not easy. You wind up with a cubic polynomial, which is solvable, but extremely difficult. Solution
That is neither an inequality nor an identity. WolframAlpha
Now, if you want to know for what values of you have , that is solvable, but not easy. You wind up with a cubic polynomial, which is solvable, but extremely difficult. Solution