1.
If ff and gg are twice differentiable on (0,3)(0,3) with f=gf''=g'', f(1)=4f'(1)=4, g(1)=6g'(1)=6, f(2)=3f(2)=3, g(2)=9g(2)=9, then f(1)g(1)=f(1)-g(1)=