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Verified answer
2Sin²a + 2Sin a < 3/24Sin²a + 4Sina - 3 < 0
(2Sin a - 1)(2Sin a + 3) < 0
-3/2 < Sin a < 1/2
Sin a > -3/2
Tidak memenuhi
Sin a < 1/2
Sin a < Sin 30° , Sin 150°
a < 30° , 150°
a < 1/6 pi
a > 5/6 pi
Gabungkan Hp ny didapat...
Hp : {0 < a < 1/6 pi atau 5/6 pi < a < pi}
Verified answer