Tentukan nilai x yang memenuhi persamaan berikut,untuk . a. b.
terima kasih :)
ekamiaww
(sin x + 1) (sin x + 2) = cos² x (sin x + 1) (sin x + 2) = 1 - sin² x (sin x + 1) (sin x + 2) = (1 + sin x) (1 - sin x) sin x + 2 = 1 - sin x sin x + sin x = 1 - 2 2.sin x = -1 sin x = - 1/2 sin x = sin 210
x = α + k.360 atau x = (180 - α) + k.360 x = 210 + k.360 x = (180 - 210) + k.360 k = 0 --> x = 210 x = -30 + k.360 k = 0 --> x = -30 (bukan penyelesaian) k = 1 --> x = 330 Hp : {210,330}
(sin x + 1) (sin x + 2) = 1 - sin² x
(sin x + 1) (sin x + 2) = (1 + sin x) (1 - sin x)
sin x + 2 = 1 - sin x
sin x + sin x = 1 - 2
2.sin x = -1
sin x = - 1/2
sin x = sin 210
x = α + k.360 atau x = (180 - α) + k.360
x = 210 + k.360 x = (180 - 210) + k.360
k = 0 --> x = 210 x = -30 + k.360
k = 0 --> x = -30 (bukan penyelesaian)
k = 1 --> x = 330
Hp : {210,330}
semoga membantu ya :)