计算方法上机实习作业： 积分计算。采用Delphi实现

设计一个GUI程序，用于演示采用分割、近似、求和的近似方法来计算初等函数的 ， 的定积分-Design a GUI program for a demonstration of the use of the split, the approximate sum approximation method to calculate the elementary functions, the definite integral

delphi中数值计算的控件源码，包括各种计算，积分微分等-Delphi source code of numerical calculation activeX, including integration , differenciation, etc.