第1269题:Limits of Composite Functions
If
limx→4f(x)−7x−2\lim\limits_{ x \rightarrow 4} \dfrac{f(x)-7}{x-2}x→4limx−2f(x)−7=1 =1=1
find limx→4f(x)\lim\limits_{ x \rightarrow 4} f(x)x→4limf(x) .