public override float Eval(float x) { return(_op(_left.Eval(x), _right.Eval(x))); }
public override float Eval(float x) { return(_op(_eval.Eval(x))); }
public override float Eval(float x) { return(_op(_left.Eval(x), _right.Eval(x))); }
public override float Eval(float x) { return(_op(_eval.Eval(x))); }