Acos(wt + u) +Bcos(wt + z)怎么化简成一个cos的函数呀
问题描述:
Acos(wt + u) +Bcos(wt + z)
怎么化简成一个cos的函数呀
答
Acos(wt + u) +Bcos(wt + z) ={A2+B2+2ABcos(u-z)}1/2*cos{wt-π/2+arctan-(Acosu+Bcosz)/(Asinu+Bsinz)}