Let f(x) = \(\sqrt[3]{x}\) for x ∈ (0, ∞), and θ(h) be a function such that

f(3 + h) − f(3) = hf′ (3 + θ(h)h) 

for all h ∈ (−1, 1). Then \(\displaystyle\lim_{h \rightarrow 0^+}\)θ(h) is equal to __________.