Jawabanmu

2014-03-02T20:29:29+07:00
2 sin ^2 x + sin x -1 =0
(2 sin x -1) ( sin x +1) = 0
sin x =1/2
x = {-330, 30}
sin x = -1
x = {-90, 270}

HP = {-330,-90,30,270}
maaf kak soalnya keliru, bukan 2sin2x, tapi 2Sin kuadrat x + Sinx - 1 = 0
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