cos(wt)*e^(st)对t的导数求解
问题描述:
cos(wt)*e^(st)对t的导数求解
要求详细说明,苦恼
答
cos(wt)*e^(st)符合函数求导
[cos(wt)*e^(st)]'=cos(wt)'*e^(st)+cos(wt)*e^(st)'
=-wcos(wt)*e^(st)+cos(wt)*s*e^(st)
=cos(wt)*e(st)*(s-w)