若-pi/3
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若-pi/3
![若-pi/3](/uploads/image/z/6077879-71-9.jpg?t=%E8%8B%A5-pi%2F3)
y=sin^2x+4sin^2(x/2)=
=sin^2x+)+2(1-cos(x))
=1-cos^2x+2-2cosx
=-cos^2x-2cosx+3=-(cosx+1)^2+4
1/2
=sin^2x+)+2(1-cos(x))
=1-cos^2x+2-2cosx
=-cos^2x-2cosx+3=-(cosx+1)^2+4
1/2