Jawabanmu

2014-03-04T22:38:06+07:00
0≤x≤2π
0≤x≤360

2sin²x+sinx=1
2sin²x+sinx-1=0
(2sinx-1)(sinx+1)=0
sinx=1/2
x={30,150}

sinx=-1
x={270}

HP={30,150,270}