If A(x)=c^2-1 and B(x)=c^2+1, then which statement is not true?

(1) A(x)*B(x)=c^3+c^2-c-1
(2) A(x)+B(x)=c^2+c
(3) A(x)-B(x)=c^2-c-2
(4) A(x) / B(x)=c+1