A limit from derivative
Posted: Tue Nov 10, 2015 9:10 pm
Let \(\displaystyle{f:\mathbb{R}\longrightarrow \mathbb{R}}\) be a differentiable function at \(\displaystyle{x_0=0}\) and
\(\displaystyle{f(0)=0}\) . If \(\displaystyle{k\in\mathbb{N}}\), then evaluate the limit :
$$\lim_{x\to 0}\dfrac{1}{x}\,\left[f(x)+f\,\left(\dfrac{x}{2}\right)+...+f\,\left(\dfrac{x}{k}\right)\right]$$
\(\displaystyle{f(0)=0}\) . If \(\displaystyle{k\in\mathbb{N}}\), then evaluate the limit :
$$\lim_{x\to 0}\dfrac{1}{x}\,\left[f(x)+f\,\left(\dfrac{x}{2}\right)+...+f\,\left(\dfrac{x}{k}\right)\right]$$