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f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)的对称轴方程,在〖—π/12.π/2〗的值域
人气:354 ℃ 时间:2019-11-24 07:23:17
解答
f(x)=1/2 cos2x+√3/2 sin2x-cos2x=√3/2 sin2x-1/2cos2x
=sin(2x-π/6)
2x-π/6∈[-π/3,5π/6]
f(x)∈[-√3/2,1]
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