1.
Let f(x+y)=f(x)⋅f(y)f(x + y) = f(x) \cdot f(y), ∀x,y∈R\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