Entegrasyon (matematik): Diferans ant vèsyon yo

 

<math>\sum_{i=1}^{n-1} \frac{f(x_i)+f(x_{i+1})}{2}\cdot p = \sum_{i=1}^{n-1} f(x_i) \cdot p + \frac{f(x_1)+f(x_{n})}{2} \cdot p</math>