作业帮Solve the equation cosx= -0.4 on the interval 0≤x＜2π.
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/30 03:39:48
x) )KU(HUH-,M,SH/U53Q @Ry%Ee9
:T3|MR>% l( VO,J
i
:; ,-S2*@ʍ7 ڈVhmbBRBb^%ؾ"
Solve the equation cosx= -0.4 on the interval 0≤x＜2π.
Solve the equation cosx= -0.4 on the interval 0≤x＜2π.
Solve the equation cosx= -0.4 on the interval 0≤x＜2π.
cosx = -0.4
arccos(-0.4) ≈ 1.98 radians
x = 2nπ±arccos(-0.4),n can be any integer
n = 0:x = 2nπ+arccos(-0.4) = 1.98
n = 1:x = 2nπ－arccos(-0.4) = 2π - 1.98 = 4.30