y=sinxcos(1 x)的间断点
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/12 12:31:11
cos(x+π/6)=cosxcosπ/6-sinxsinπ/6所以y=sinx(√3/2*cosx-1/2*sinx)-1/2*cos2x=√3/2*sinxcosx-1/2sin²x-1
cos²x=1-sin²x=(1+sinx)(1-sinx).∴y=2sinx(1-sinx)=-2(sin²x-sinx)=-2[sinx-(1/2)]²+(
原式=2sinxcos(x+π/3)+√3cos²x+sinxcosx=2sinxcos(x+π/3)+cosx(√3cosx+sinx)=2sinxcos(x+π/3)+2cosx·sin
f(x)=2(cosx)^2-2√3sinxcosx-1=(cos2x+1)-√3sin2x-1=cos2x-√3sin2x=2cos(2x+π/6)周期T=2π/│ω│=2π/2=π因为y=cosx
f(x)=(1+cos2x)/2+(√3/2)sin2x+3/2=(√3/2)sin2x+(1/2)cos2x+2=sin2xcos(π/6)+cos2xsin(π/6)+2=sin(2x+π/6)+
(1)最简单的方法是用“积化和差”公式2sinαcosβ=sin(α+β)+sin(α-β)原式=2×2sinxcos(x+π/3)=2[sin(x+x+π/3)+sin(x-x-π/3)]=2[si
答:y=sin2x+2sinxcosx+2cos2x=2sin2x+2cos2x=2√2sin(2x+π/4)1)当sin(2x+π/4)=-1时,y的最小值为-2√22x+π/4=2kπ-π/2,x
y'=cosx-3sin²xcosx
能不能加上括号?y=(2sinxcos^2x)/(1+sinx)=[2sinx(1-sin^2x)]/(1+sinx)=[2sinx(1+sinx)(1-sinx)]/(1+sinx)=2sinx(1
y=sin方x+sinxcos(派/6-x)=(3/2)sin²x+(√3/2)sinxcosx=(√3/2)sin(2x-π/3)+3/4周期为π增区间为[kπ-π/12,kπ+5π/12
y=2sin²x-√3sinxcosx+cos²x=sin²x-√3sinxcosx+(sin²x+cos²x)=(1-cos2x)/2-√3/2*s
左式中1=(sinx平方+cosx平方-2sinxcosx)/(cosx+sinx)(cosx-sinx),\x0d约去cosx-sinx后,\x0d=(cosx-sinx)(cosx+sinx),然
y=2sinxcos^2x/(1+sinx)=2sinx﹙1-sin²x﹚/(1+sinx)=2sinx﹙1-sinx﹚=-2﹙sinx-½﹚²+½y=sin^
y=2√3*sinxcosx+2cos^2x=√3sin2x+cos2x+1=sin(2x+π/6)+1∴最小正周期:t=2π/2=π
1)f(x)=sinxcosφ+cosxsinφ=sin(x+φ)(其中x属于R,0﹤φ﹤派)点(6分之派,1)在函数y=f(x)的图像上,1=sin(6分之派+φ),φ=3分之派2)f(x)=sin
正在解答再问:答案呢我问你再答:放心,包正确再答:正在解答啊再问:答案给我就给好评再问:要全面再答:再答:再做第二问再答:合作愉快再答:把横坐标变为原来的二分之一再问:亮一点再答:图像向左平移六分之派
y=2sinxcos^2x/1-sinx=2sinx(1+sinx)=2(sinx+1/2)^2-1/2-1/2≤sinx+1/2≤3/20≤(sinx+1/2)^2≤9/4函数y=2sinxcos^
解原式=2sinxcos(x+π/3)+根号3cos的平方x+1/2sin2x=2sinxcos(x+π/3)+根号3cos的平方x+sinxcosx=2sinxcos(x+π/3)+cosx(根号3
令f'(x)=-sinx+cos^2(x)-sin^2(x)=-sinx+1-2sin^2(x)=0得sinx=1/2或sinx=-1.x=2k*pi+pi/3或2k*pi+2pi/3或x=2k*pi
由题有:f(x)=2sin(2x+兀/6)因为:x属于[0,丌/2]所以:2x+兀/6属于[丌/6,7丌/6]所以:f(x)值域为:[-1,2]