Jawabanmu

2014-04-22T21:01:49+07:00
X^{0}=1- 2sin^{2}
maka didapat 1- 2sin^{2} x + 7sin x-4=0
-2sin^{2}x + 7sin x-3=0
2sin^{2}x - 7sin x+3=0
(2sinx-1) (sinx-3) = 0
sin x= \frac{1}{2} atau sinx=3
x=30,150