1.
Let f(x+y)=f(x)f(y)f(x + y) = f(x) \cdot f(y), x,yR\forall x, y \in \mathbb{R}. Suppose that f(3)=3f(3) = 3 and f(0)=11f'(0) = 11, then f(3)f'(3) is given by