Jawabanmu

2014-02-28T07:54:26+07:00
Cos 2x - sin x = 0
(1 - 2 sin²x) - sin x = 0 
-2sin²x - sin x + 1 =0
2sin²x + sin x - 1 = 0
(2sin x -1) (sin x + 1) = 0
sin x = 1/2       V     sin x = -1
      x = 30,150             x  = 270
Jdi, Hp : {30, 150, 270} ==> dalam derajat.
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