Jawabanmu

2014-06-06T08:04:01+07:00
Tan (x - 30) = -1
tan (x - 30) = tan 135
x - 30 = 135 + k.180
x = 165 = k.180
k = 0 maka x = 165 = 11π/12
k = 1 maka x = 345 = 23π/12