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Persmaan Trigonometrisin (x/2 ) = sin (π/4) pada interval 0≤ x ≤ 2π
sin (x/2) = sin 45
x/2 = 45 + k. 360 atau x/2 = 135 + k. 360
x = 90 + k.720 atau x = 270 + k. 720
k = 0,1,2,..
k = 0 --> x = 90 , atau x = 270
x = 90 , 270
atau
x = π/2 , 3/2 π