y=sinx^2 根号3cosxsinx-1的值域

Y=2√3sinX+2cosX-√2=4(sinx*√3/2+cosx*1/2)-√2=4sin(x+π/6)-√2故y的最小值是-4-√2,最大值是4-√2

sinx+根号3cosx=22(sinx/2+根号3cosx/2)=2sinx/2+根号3cosx/2=1sinxcosπ/3+cosxsinπ/3=1sin(x+π/3)=1所以x+π/3=2kπ+

y=2√3sinx-2cosx-√2=4(√3/2sinx-1/2cosx)-√2=4(sinxcosπ/6-cosxsinπ/6)-√2=4sin(x-π/6)-√2最小值为当sin(x-π/6)=

y=2√3(cosx*√3/2-sinx*1/2)=2√3(cosxcosπ/6-sinxsinπ/6)=2√3cos(x+π/6)所以值域[-2√3,2√3]

要哪样?

y=sinxcosx-√3(cosx)^2+√3/2=1/2*sin2x-√3*[(1+cos2x)/2]+√3/2=(sin2x)/2-(√3/2)*cos2x-√3/2+√3/2=√[(1/2)^

y=√3cosx+sinx=2[(√3/2)cosx+(1/2)sinx]=2(sinπ/3cosx+cosπ/3sinx)=2sin(x+π/3)所以它的最小正周期=2π；图像的对称轴为:x=kπ+

y=sinx+2sinx的绝对值的周期是2π,对的y=(2+sinx)/√3cosx→√3ycosx=2+sinx→sinx-√3ycosx=-2→sin(x-θ)=-2/√(1+3y^2);其中ta

不用画图值域就是[-2,2]因为y=cosx的值域是[-1,1]

y=√3sinx/(2-cosx)y'=【√3cosx(2-cosx)-√3sinxsinx】/(2-cosx)²令y'=0,则√3cosx(2-cosx)-√3sinxsinx=0,cos

y=根号3*cosx/(2+sinx)√3*cosx=Y（2+sinx）Ysinx-√3*cosx=-2Y（Y²+3）sin(x-θ)=-2ysin(x-θ)=-2y/(Y²+3)

y=cosx(sinx-√3cosx)+√3/2=cosxsinx-√3(cosx)^2+√3/2=sin2x/2-√3cos2x/2=sin(2x-π/3)当x=-π/2时y=sin(-π-π/3)

Y=sinx*cosx*√3+cos^2x=√3/2*sin2x+1/2*cos2x+1/2=sin(2x+∏/6)+1/2.

不管怎么写,都是有意义的.它只是函数,不存在成立不成立的问题.

辅助角公式,正负3闭区间

(1)y=1+(sinx)^2+根号3*cosx*sinx=1+(1-cos2x)/2+根号3/2*sin2x=sin(2x-π/6)+3/2所以最大值为5/2,此时,2x-π/6=2kπ+π/2,x

没错,f(x)=2sin(2x+π/6)周期T=2π/2=π因为-1≤sin(2x+π/6)≤1f(x)max=2f(x)min=-2

y=√3cos²x＋sinxcosx=√3(1+cos2x)/2+1/2*2sinxcosx=√3/2+√3/2*cos2x+1/*sin2x=√3/2+sinπ/6cos2x+cosπ/6

y=sinx/2(根号3sinx/2-cosx/2)=√3sinx/2sinx/2-1/2sinx=√3/2-√3/2cosx-1/2sinx=√3/2+sin（x-2π/3）函数最大值是√3/2+1

令cosa=√21/7,sina=2√7/7y=√3sinx+2cosx=√7(√21/7*sinx+2√7/7cosx)=√7(sinxcosa+cosxsina)=√7sin(x+a)-1