`sin(2x) = sin(2x - pi/6)`$\\$`<=>sin(2x) - sin(2x - pi/6) = 0`$\\$`<=>2cos((24x - pi)/12) * sin(pi/12) = 0`$\\$`<=>2sin(pi/12) * cos((24x - pi)/12) = 0`$\\$`<=>2sin(pi/4 - pi/6) * cos((24x - pi)/12) = 0`$\\$`<=>2(sin(pi/4) * cos(pi/6) - cos(pi/4) * sin(pi/6)) * cos((24x - pi)/12) = 0`$\\$`<=>2((sqrt(2))/2 * (sqrt(3))/2 - (sqrt(2))/2 * 1/2) * cos((24x - pi)/12) = 0`$\\$`<=> 2((sqrt(6))/4 - (sqrt(2))/4) * cos((24x - pi)/12) = 0`$\\$`<=>2 * (sqrt(6) - sqrt(2))/4 * cos((24x - pi)/12) = 0`$\\$`<=>(sqrt(6) - sqrt(2))/2 * cos((24x - pi)/12) = 0`$\\$`<=>(cos((24x - pi)/12) * (sqrt(6) - sqrt(2)))/2 = 0`$\\$`<=>(sqrt(6) * cos((24x - pi)/12) - sqrt(2) * cos((24x - pi)/12))/2 = 0`$\\$`<=>sqrt(6) * cos((24x - pi)/12) - sqrt(2) * cos((24x - pi)/12) = 0`$\\$`<=>(sqrt(6) - sqrt(2)) * cos((24x - pi)/12) = 0`$\\$`<=>cos((24x - pi)/12) = 0`$\\$`<=>(24x - pi)/12 = pi/2` hoặc `(24x - pi)/12 = (3pi)/2`$\\$`<=>(24x - pi)/12 = pi/2 + 2kpi(k in mathbb Z)` hoặc `(24x - pi)/12 = (3pi)/2 + 2kpi(k in mathbb Z)`$\\$`<=>x = (7pi)/24 + kpi(z in mathbb Z)` hoặc `x = (19pi)/24 + kpi(k in mathbb Z)`$\\$`=>x = (7pi)/24 + (kpi)/2(k in mathbb Z)`