已知函数f x=3sin[2分之1x]

f(x)=√3sin²x+sinxcosx=√3[(1-cos2x)/2]+1/2sin2x=1/2sin2x-√3/2cos2x+√3/2=sin(2x-π/3)+√3/2∵x∈[π/2,

(1)f(x)=2sin(2x+π/3)+2由2x+π/3=kπ+π/2,k∈Z得2x=kπ+π/6,k∈Z对称轴方程为x=kπ/2+π/12,k∈Z(2)g（x）=f（x）+m=2sin(2x+π/

fx=2sin(2x+pai/6)振幅A=2最小正周期T=2pai/2=paix∈【0,pai/]2xE[0,2pai]2x+pai/6E[pai/6,2pai+pai/6]很明显,设u=2x+pai

周期等于2派.g(x)=2sinx;基函数再问：有过程吗？？再答：这可以看出来，还要过程吗，，，，周期等于2派/x前的数1===2派；；g(x)=2sint(x+pi/3+p1/3)=2sinx;si

1、最小正周期T=2π/2=π;最大值=2×1+2=4；2、单调递增式时-π/2+2kπ≤2x+π/3≤π/2+2kπ(k∈Z)-5π/6+2kπ≤2x≤π/6+2kπ(k∈Z)-5π/12+kπ≤x

f(x)=2sin(2x+π/3)最小正周期：2π/ω=2π/2=π最小值：f(x)=2*(-1)=-2最大值：f(x)=2*1=2当sin(2x+π/3)=-1时,取得最小值；2x+π/3=2kπ-

(1)f（x）=sin（2x+π/6）+3/2,最小正周期为2π/2=π,单增区间为2Kπ-π/2

答：f(x)=2sin(x-π/3)cosx+sinxcosx+√3(sinx)^2=sin(x-π/3+x)+sin(x-π/3-x)+sinxcosx+(√3/2)(1-cos2x)=sin(2x

答：y=f(x)=2√3sinxcosx-2sin²x=√3sin2x+cos2x-1=2*[(√3/2)sin2x+(1/2)cos2x]-1=2sin(2x+π/6)-1y=f(x)关于

等一下再答：

f(x)=2sin(x-π/6)cosx+2cos²x=(2sinxcosπ/6-2cosxsinπ/6)cosx+2cos²x=√3sinxcosx-cos²x+2co

第一题A.第二题B

（1）化简可得f(x)=(sin(x/2))^2+((√3)/2)sinx-0.5f'(x)=sin(x/2)cos(x/2)+((√3)/2)cosx=sinx+√3cosx=0√3cosx=-si

你的分析前一半是对的,一直到“那么2x的单调增区间是[-4分之π,4分之π]”.2x的单调递增区间是[-π/2,π/2],x的才是[-π/4,π/4].所以函数在x=-π/3处取得最小值为-2分之根号

(1)fx=sin(2x+φ)经过点(π/12,1)sin(π/6+φ)=1∴π/6+φ=π/2+2kπ,k∈Z∴φ=π/3+2kπ,k∈Z∵0

解答；f(x)=sin(2x+3分之π)∴sin(2x+π/3)=-3/5∵x∈(0,π/2)∴2x+π/3∈(π/3,4π/3)∵sin(2x+π/3)

解1当2kπ-π/2≤2x+π/3≤2kπ+π/2,k属于Z时,y是增函数即2kπ-5π/6≤2x≤2kπ+π/6,k属于Z时,y是增函数即kπ-5π/12≤x≤kπ+π/12,k属于Z时,y是增函数

f(x)=sin(x/2)cos(x/2)+√3*sin²(x/2)+√3/2=1/2*sinx+√3/2*(1-cosx)+√3/2=1/2*sinx-√3/2*cosx+√3=sin(x

f(x)=√3sin2x-2sin²x=√3sin2x-(1-cos2x)=2sin(2x+π/6)-1∴当sin(2x+π/6)=1时f(x)max=2*1-1=1