sin (3ɵ + ð/18) = 1
look at your sine curve. the sine is 1 at 90º or pi/2 so 3ɵ + pi/18 = pi/2 multiply 3ɵ + pi/18 = pi/2 by 18 54ɵ + pi = 9pi ɵ = 8pi/54 = 4pi/27
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