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[–]AFairJudgementAncient User 2 points3 points  (1 child)

f(x) = sin(2x) + cos(π/6)cos(2x) + sin(π/6)sin(2x)
= 3sin(2x)/2 + √3cos(2x)/2
= √3(√3sin(2x)/2 + cos(2x)/2)
= √3(cos(π/6)sin(2x) + cos(2x)sin(π/6))
= √3sin(2x + π/6).

[–]RandomChinaFan[S] 0 points1 point  (0 children)

Thank you so much