若0

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 15:43:02

若0
若0

若0
f(x)=2sinxcosx+2√3cos^2-√3
=sin2x+√3(2cos^2-1)
=sin2x+√3cos2x
=2sin(2x+60°)
60°

原式化简为sin2x+根号3cos2x=sin(2x+派/3) 值域为 根号3/2到1 左开右闭

f(x)=2sinxcosx+2√3cosx^2-√3
=sin(2x)+√3(2cosx^2-1)
=sin(2x)+√3cos(2x)
=2(1/2sin(2x)+√3/2cos(2x))
=2(cos60*sin(2x)+sin60*cos(2x))
=2sin(2x+60)
当0所以√3/2<=sin(2x+60)<=1
所以√3<=2sin(2x+60)<=2
即√3<=f(n)<=2