Brief introduction：
In numerical analysis, Brent's method is a complicated but popular root-finding algorithm combining the bisection method, the secant method and inverse quadratic interpolation. It has the reliability of bisection but it can be as quick as some of the less reliable methods.
在数值分析领域，Brent方法是一个复杂的、但是却很流行的寻根算法，它结合了二分法、割线法以及反向二次插值法的特点。它具有二分法的稳定性，但是它的速度却可与一些不太稳定的方法相比拟。