C:\Documents and Settings\hlt32\My Documents>javac Poly.java
Poly.java:251: mulByx(Poly) in Poly cannot be applied to ()
            P[n] = (P[n-1].polyMinus( (P[n-1].mulByx()).mulByCoeff(2*n-1), P[n-2
].mulByCoeff(n-1) )).divByCoeff(n);
                                        ^
Poly.java:251: mulByCoeff(Poly,long) in Poly cannot be applied to (int)
            P[n] = (P[n-1].polyMinus( (P[n-1].mulByx()).mulByCoeff(2*n-1), P[n-2
].mulByCoeff(n-1) )).divByCoeff(n);
                                                                            ^
2 errors