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cos (x - 200) = √3/2
cos (x - 200) = cos 30
x - 200 = 30 + k. 360
jika k = 0 maka
x - 200 = 30
x = 230
atau
x - 200 = -30 + k.360
jika k = 0
x - 200 = -30
x = 170
HP = (170, 230)