hitunglah nilai x yang memenuhi tan 3x = 1,0 kurang dari x kurang dari 180°

tan 3x = 1, 0 < x  < 180
tan 3x = 1 = tan 45
3x = 45 + n 180
x = 15 + n. 60
n = 0,1,2,3,...
n = 0 → x = 15
n = 1 → x =15+60 = 75
n = 2 → x = 15 +120 = 135
n = 3 → x = 15 + 180 = 195
hp x = (15, 75, 135)