数学题求大神解释,谢谢(*°∀°)=3
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f(x)=2(sinx)^2+2√3sinxcosx+1
f(x)=√3sin2x-cos2x+2
f(x)=2sin(2x-π/6)+2
T=2π/2=π
0<=x<=π/2
0<=2x<=π
-π/6<=2x-π/6<=5π/6
简单画个y=sinx的图像,看看-π/6和5π/6这段
发现有-1/2<=sin(2x-π/6)<=1
即(2x-π/6)=-π/6和(2x-π/6)=π/2时取等
1<=2sin(2x-π/6)+2<=4,即为所求
f(x)=√3sin2x-cos2x+2
f(x)=2sin(2x-π/6)+2
T=2π/2=π
0<=x<=π/2
0<=2x<=π
-π/6<=2x-π/6<=5π/6
简单画个y=sinx的图像,看看-π/6和5π/6这段
发现有-1/2<=sin(2x-π/6)<=1
即(2x-π/6)=-π/6和(2x-π/6)=π/2时取等
1<=2sin(2x-π/6)+2<=4,即为所求
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