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2 Sinx = √3
Sinx = 1/2 √3
x = 60' , 120' HP {60' , 120'}
b. cos 2x - 1 = 0
Cos 2x = 1
2x = 0 + k . 360
x = 0 + k.180' , k ∈ bil Bulat
x = 0, 180' , 360'
2x = 360' + k . 360'
x = 180' + k. 180'
x = 180' 360'
HP { 0 , 180' , 360'}