f(x)=sin(2x+α)+acos(2x+α)=√(1+a²)sin(2x+α+β),tanβ=a
由f(x)最大值为2知,a=√3,β=π/3
由f(x)的图像关于直线x=π/6对称知,2×π/6+π/3+α=π/2或3π/2,而有α范围知α=5π/6.
从而得f(x)=2sin(2x+7π/6)
2 y=2sin(2x+π/3) 是由f(x)=2sin(2x+7π/6)沿x正方向平移π/4单位得到
f(x)=sin(2x+α)+acos(2x+α)=√(1+a²)sin(2x+α+β),tanβ=a
由f(x)最大值为2知,a=√3,β=π/3
由f(x)的图像关于直线x=π/6对称知,2×π/6+π/3+α=π/2或3π/2,而有α范围知α=5π/6.
从而得f(x)=2sin(2x+7π/6)
2 y=2sin(2x+π/3) 是由f(x)=2sin(2x+7π/6)沿x正方向平移π/4单位得到