【摘要】 考察自由项为cose~x或sine~x的n阶常系数非齐线性方程，给出了求其特解的两种简单有效的方法：（1）Lagrange参数变易法和函数矩阵的初等行变换相结合的方法；（2）特榜公式．更多还原

【Abstract】 Method associating Lagrange’s method of variation of parameters with elementaryrow operation and the formular of particular solution are given to obtain a particular integral of P(D)y = cosex (or sinex )where P(D)is a Linear differential operator.更多还原