f(x) = √3sin²x - sinx cosx= √3 × (1 - cos(2x))/2 - (sin(2x))/2 (利用二倍角公式)= √3/2 - (√3/2)cos(2x) - (1/2)sin(2x)= √3/2 - sin(π/3) cos(2x) - cos(π/3) sin(2x)= √3/2 - sin(π/3 + 2x) (...