Limit Definition of a Derivative: m=f'\left(x\right)=
- \lim_{h\to0}\frac{f\left(x+h\right)+f\left(x\right)}{h}
- \lim_{h\to0}\frac{f\left(x-h\right)+f\left(x\right)}{h}
- \lim_{h\to0}\frac{f\left(x-h\right)-f\left(x\right)}{h}
- \lim_{h\to0}\frac{f\left(x+h\right)-f\left(x\right)}{h}