已知函数fx=sin(wx+Ф)(其中w>

1个回答

  • (1)函数y=f(x)的函数与x 轴的任意两个相邻交点间的距离为π/2,

    说明函数y=f(x)的半周期为π/w=π/2,故w=2,

    直线x=π/6是函数y=f(x)图像的一条对称轴,

    说明2×π/6+Ф=π/2+kπ,k∈Z,

    可得Ф=π/6,

    所以,f(x)=sin(2x+π/6);

    (2)根据(1)的结果,结合题意可得

    h(x)=f(x)+g(x)

    =sin(2x+π/6)+2sin²x

    =(√3/2)sin2x+(1/2)cos2x+1+cos2x

    =(√3/2)sin2x+(3/2)cos2x+1

    =√3[(1/2)sin2x+(√3/2)cos2x]+1

    =√3sin(2x+π/3)+1

    其单调增区间为

    -π/2+2kπ<2x+π/3<π/2+2kπ,k∈Z

    -5π/12+kπ<x<π/12+kπ,k∈Z