3X方-6-X方+2X=0
问题描述：
3X方-6-X方+2X=0
答
=sin(π/6-x) =-sin(x-π/6) 所以y=sin(3x π/3)cos(x-π/6)=cos(2x) ∴对称轴为2x=kπ,即x=kπ/2,k∈Z 若取k=0,得x=0
3X方-6-X方+2X=0
=sin(π/6-x) =-sin(x-π/6) 所以y=sin(3x π/3)cos(x-π/6)=cos(2x) ∴对称轴为2x=kπ,即x=kπ/2,k∈Z 若取k=0,得x=0