Free, open-source online mathematics for students, teachers and workers

Given a function $f(x)$, its derivative is

$$f'(x)=\displaystyle\lim_{h\longrightarrow 0}\dfrac{f(x+h)-f(x)}{h}$$

For instance,

$$f'(5)=\displaystyle\lim_{h\longrightarrow 0}\dfrac{f(5+h)-f(5)}{h}$$