要得到函数y=3sin[2x+四分之派]的图像,只需将函数y=3sin2x
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y=-sin(π/3-2x)y=sin(2x-π/3)【诱导公式:sin(-x)=-sinx】因为左右平移是针对X而言的,所以此式中2x等价于X所以答案是:向右平移π/6个单位.
要得到函数y=sin(2x+π3)的图象可将y=sin2x的图象向左平移π6个单位.故选B.
假设将函数y=sin2x的图象平移ρ个单位得到y=sin2(x+ρ)=sin(2x+2ρ)=sin(2x−π3)∴ρ=-π6∴应向右平移π6个单位故选D.
缩小1/4,右,π/6即sinx/2(x缩小为原来的1/4)得到sin2x;再向右(左加右减)平移π/6,sin2(x-π/6)=sin(2x-π/3)
y=sin(π/3-x)=sin(π/6-(x-π/6))所以向右平移π/6个单位
将图像向右移动π/3
只需将y=3sin2x图像向左移π/8个单位.y=3sin[2(x+π/8)]=3sin(2x+π/4)
只需将原函数左移2∏/3……再问:大错特错再答:请给出理由。再问:y=sin[(1/2)x-(∏/3)]=sin[1/2(x-2/3∏)]哦,对了,对不起,看错了!!!
y=sin(2x+π3)=cos[π2-(2x+π3)]=cos(π6-2x)=cos(2x-π6)=cos[2(x-π12)].故把cos[2(x-π12)]的图象向左平移π12个单位,即得函数y=
由于函数y=2sin(2x+2π3)=2sin2(x+π3),函数y=2sin(2x−2π3)=2sin2(x-π3),故要得到函数y=2sin(2x+2π3)的图象,需要将函数y=2sin(2x−2
∵y=sin2x向右平移π8y=sin(2x−π4)故选:D
y=sin(2x+2π3)=sin2(x+π3),所以,要得到函数y=sin(2x+2π3)得图象,只需将y=sin2x的图象向左平移π3个单位,故选D.
y=sin(-1/2x+π/6)=sin(-1/2(x-π/3))向左移动π/3个单位.
y=-sin(2x-π/3)=cos(2x-π/3+π/2)=cos(2x+π/6)=cos[2(x+π/12)]所以要得到y=-sin(2x-π/3)的图像,只需将函数y=cos2x的图像向左平移π
∵y=cos2x=sin(2x+π2)假设只需将函数y=sin(2x-π3)的图象平移φ个单位得到,则sin[2(x+φ)-π3]=sin(2x+π2)∴2(x+φ)-π3=2x+π2,φ=5π12故
函数y=2cos(x+π/6)sin(π/3-x)-1=2cos(x+π/6)sin[(π/2-((x+π/6))]-1=2cos(x+π/6)cos(x+π/6)-1=2cos²(x+π/
y=sin[2x-(π/3)]=sin[2(x-π/6)]y=sin2x正弦函数x前无符号上加下减,左加右减所以,把y=sin2x“向右平移(π/6)个单位”是对的PS你题目里应该是3,错打成2了吧?
y=cos(x+2π3)=sin[π2-(x+2π3)]=sin(-π6-x)=sin[π3-(x+π2)]故把函数f(x)=sin(π3-x)的图象向左平移π2个单位,即得函数y=cos(x+2π3