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tan (2x - 10) = 1/3 √3
2x - 10 = 30 + k.180
2x = 40 + k.180
x = 20 + k.90
x = 20' , 110' , 200' , 290'
HP {20' , 110' , 200' , 290,} karena intervalnya 0 ≤ x ≤ 180 , maka HP {20' , 110'}