y=(1+cosx)×sin(x/2) (0

来源:学生作业帮助网 编辑:六六作业网 时间:2025/01/11 03:24:00
y=(1+cosx)×sin(x/2)(0y=(1+cosx)×sin(x/2)(0y=(1+cosx)×sin(x/2)(0y={1+1-2[sin(x/2)]^2}Xsin(x/2)令t=sin(

y=(1+cosx)×sin(x/2) (0
y=(1+cosx)×sin(x/2) (0

y=(1+cosx)×sin(x/2) (0
y={1+1-2[sin(x/2)]^2} X sin(x/2)
令t=sin(x/2)
化简 y=2t-2t^3
0

y=(2-(sin(x/2))^2)*sin(x/2)
=-(sin(x/2))^3+2sin(x/2)
然后把sin(x/2)看成一个整体,令为u,0再求导得到:y~= -3u^2+2,令y~=0,求的u的值,
再带入原式即可。