已知函数f(x)=根号cosx lg(8x-x^2),则f(x)的定义域为

已知:函数f(x)=2sinxcosx+2√3cos²x-√3求:(1)单调增区间和最小正周期；(2)当x∈[-π/4,π/4]时求最值.f(x)=2sinxcosx+2√3cos²

f(x)=2cosx(cosx+根号3sinx）=2cos^2x+2*根号3sinx*cosx=cos2x+根号3sin2x+1当cos2x=1/2sin2x=根号3/2有最大值3当cos2x=-1/

因为：函数f(x)=2cosx·sin（x+π/3)-√3(sinx)^2+sinx·cosx=2cosx·sin(x+∏/3)-√3(sinx)^2+sinx·cosx=2cosx·sinx·cos

(1)f(x)=(1/2)sinx+(√3/2)cosx=sin(x+π/3)最小正周期=2π值域=[-1,1](2)f(A)=√3/2sin(A+π/3)=√3/2A+π/3=2π/3A=π/3a=

（1)f(t)=√[(1-t)/(1+t)]f(sinx)=√[(1-sinx)/(1+sinx)]f(cosx)=√[(1-cosx)/(1+cosx)]g(x)=cosx*f(sinx)+sinx

y=f(x)=(sinx)平方-根号3sin(pai+x)*cosx=(1/2)(1-cos2x)+根号3sinxcosx=(√3/2)sin2x-(1/2)cos2x+1/2=sin(2x-π/6)

（1）f(x)＝.2sinx3(sinx−cosx)sinx+cosxcosx.＝sin2x+3cos2x＝2sin(2x+π3)…（3分）所以函数f（x）的最小正周期为π…（3分）（2）

f(x)=sinx+根号3cosx=2*sin(x+pi/3)1.T=2pi2.x用x-pi/3代替:y=sinx单调增区间：【0,pi/2】

1a·b=√3sinxcosx+cosx^2=√3sin(2x)/2+(1+cos(2x))/2=sin(2x+π/6)+1/2故：f(x)=a·b-1/2=sin(2x+π/6)最小正周期：T=2π

f（x）=sinx+√3cosx=2(1/2sinx+√3/2cosx)=2(cosπ/3sinx+sinπ/3cosx)=2sin(x+π/3)所以最小正周期为：2π振幅为2再答：请采纳哦，谢谢再答

这个简单：f(x)=2cosx(sinxcos(pi/3)+cosxsin(pi/3))-根号33sin^2x+sinx*cosx=2sinxcosx+根号3cos2x=2sin(x+pi/3)所以：

f(x)=2(sinxcosπ/6-cosxsinπ/6)=2sin(x-π/6)-1≤sin(x-π/6)≤1-2≤f(x)≤2值域是[-2,2]

f(x)=√2(sinx-cosx)=2*【sinxcos（-π/4）+cosxsin（-π/4）】=2sin（x-π/4）1）、f（x）的最小正周期为T=2π值域为【-2,2】2）、图像过点(α,6

f(x)=cos²x+√3sinxcosx=1/2(2cos²x-1)+√3sinxcosx+1/2=1/2cos2x+√3/2sin2x+1/2=cos(2x-π/3)+1/2当

1、f(x)=(√3/2)sin2x+(1/2)cos2x=sin(2x+π/6)周期T=2π/2=π当x∈【0,π/2】时,2x+π/6∈【π/6,7π/6】则sin(2x+π/6)∈【-1/2,1

f(x)=sinx+根号3cosx=2sin(x+π/3),即最小正周期为2π得到的g(x)=2sin(x+π/3-π/3)=2sinx,即在(O,π/2】上单调递增,在【π/2,π）上单调递减

f(x)=（1/2）2sinx*cosx+√3*cosx^2=1/2sin2x+√3/2（2cos^2-1)+√3/2=1/2sin2x+√3/2cos2x+√3/2=cos60sin2x+cos2x

f(x)=√3sinxcosx+(cosx)^2+m=sin(2x+π/6)+m+1/21.最小正周期T=2π/2=π2.x∈[-π/6,π/3]2x+π/6∈[-π/6,5π/6]可见x=-π/6时

1、由x范围则cosx>0sin²x+cos²x=1所以cosx=3/5所以f(x)=(4√3-3)/52、f(x)=2(sinx*√3/2-cosx*1/2)=2(sinx