已知sin(x π 3)=1 2,则sin(2x π 6)等于
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1、由于函数g(x)=sin(2(x-a)+π/3)为偶函数,所以g(x)的图像关于y轴对称,即函数g(x)当x=0时取得最值,所以g(0)=±1,解得sin(π/3-2a)=±1,sin(2a-π/
cos(xπ/3)=cos(π/2-(-xπ/6))=sin(π/6-x)=3/5
由sin(x+π/6)=0.25得cos(x-π/3)=-0.25,原试可整理为cos(x-π/3)+1-cos(x-π/3)*cos(x-π/3)=11/16
(1)f(x)=√3(1-cos2x)-1/2sin2x+√3/2cos2x=√3-1/2sin2x-√3/2cos2x=√3-sin(2x+π/3)∴最小正周期T=2π/2=π单调增区间:π/2+2
2sin(x-π/4)sin(x+π/4)=cos(x-π/4-x-π/4)-cos(x-π/4+x+π/4)=-cos2xf(x)=cos(2x-π/3)-cos2x=cos(2x-π/6-π/6)
sin(x-3π/4)=sin[π-(π/4-x)]=sin(π/4-x)=-sin(x-π/4)sin(x-3π/4)cos(x-π/4)=-sin(x-π/4)cos(x-π/4)=-sin(2x
∵f(x)=[-sinx(-sinx)cos(π+x)]/[-2cosxsin(π-x)]=[sin²x(-cosx)]/(-2cosxsinx)=1/2sinx∴最小正周期T=2π∴函数图
f(x)=sin(2x+π/3)+sin(2x-π/3)+2cos^2x-1=sin2xcosπ/3+cos2xsinπ/3+sin2xcosπ/3-cos2xsinπ/3+cos2x=2sin2xc
因为f(x)=根号3sin(2x-π/6)+2sin的平方(x-π/12)=根号3sin(2x-π/6)-(1-2sin的平方(x-π/12))+1=根号3sin(2x-π/6)-cos(2x-π/6
sin(x+π/6)=1/3sin(5π/6-x)=sin[π-(x+π/6)]=1/3sin^2(π/3-x)=sin^2[π/2-(x+π/6)]=cos^2(x+π/6)=1-sin^2(x+π
f(x)=2√3sin²x-sin(2x-π/3)=√3-√3cos2x-1/2sin2x+√3/2cos2x=√3-(1/2sin2x+√3/2cos2x)=√3-sin(2x+π/3)T
fx=2cosx(0.5sinx+根号3/2cosx)-根号3sin*2x+sinxcosx=2sinxcosx+根号3(cos*2x-sin*2x)=sin2x+根号3cos2x=2sin(2x+派
f(x)=(√3sinωx+cosωx)*sin(-3π/2+ωx)=(√3sinωx+cosωx)*sin(π/2+ωx)=(√3sinωx+cosωx)*cosωx=(1/2)*(√3*2sinω
已知cos(x+π/12)=1/3,那么:cos(2x+π/6)=2cos²(x+π/12)-1=2/9-1=-7/9所以:sin(2x-π/3)=sin[(2x+π/6)-π/2]=-si
f(x)=sin^2x+2√3sinxcosx+sin(x+π/4)sin(x-π/4)=(1-cos2x)/2+√3sin2x+(1/2)2sin(x-π/4)cos(x-π/4)=2-2cos2x
(1)化解函数:√3∵f(x)=sin²wx+√3sinwxcoswx+2cos²wx=√3/2sin2wx+sin²wx+cos²wx+cos²wx
cos(5π/6-X)=-cos[π-(5π/6-X)]=-cos(x+π/6)=-sin[π/2-(x+π/6)]=-sin(π/3-X)
(x+π/6)+(5π/6-x)=π,(x+π/6)+(π/3-x)=π/2根据诱导公式:sin(5π/6-x)=sin[π-(x+π/6)]=sin(x+π/6)=1/4sin^2(π/3-x)=s
f(x)=[2(sinx*1/2+cosx*√3/2)+sinx]cosx-√3sin²x=(2sinx+√3cosx)cosx-√3sin²x=2sinxcosx+√3(cos&