Jawabanmu

2014-06-12T13:38:57+07:00
Cos(60+x)=cos0
60+x=90
x=30

x=30+k.360
k=0 ---> 30

x=-30+k.360
k=1---> 330

hp= 30,330
2014-06-12T14:36:04+07:00
Cos 60 + x = cos 0                         0<_360
60 + x = 90
x = 90 - 60
x = 30

x1   = a + k . 360
k(0) = 30 + 0.360
       = 30

x2 = (-a) + k . 360
k(0) = (-30) + 0.360
       = -30
k(1) = (-30) + 1.360
       = 330

HP ={ 30 , 330 , -30 }