pakai cara ..... tapi klau kelamaan dan udah tau jawabanya langsung isiin obsennya aja tapi jangan karuan

semoga membantu yaoke

Persamaan Trigonometri

1) cos x = ¹/₂ √3 = cos 30
x = 30 + k. 360  atau x = - 30 + k. 360
k = 0,1,2,3,..
.
k = 0 -->x = 30 , x = - 30 (tidak memenuhi)
k = 1 -->x = 390 (tidak memenuhi),  x = 330
HP x = (30, 330)

2)  tan x = ¹/₃ √3 = tan 30 = tan π/6
x = π/6 +  k. π
k = 0,1,2,3,..
.
k = 0 --> x = π/6
k = 1 --> x = π/6 + π = 7/6 π
k = 2 --> x = π/6 + 2π = 13/6 π
Hp x = ( π/6 , 7π/6, 13/6 π)

3) √2 + 2 cos x = 0
2 cos x = - √2
cos x = - ¹/₂ √2 = - cos 45
cos x =cos 135
x = 135 + k. 360 atau x = - 135 + k. 360
k = 0,1,2,3..
.
k = 0 --> x =  135  atau x = - 135 (tidak memenuhi)
k = 1 --> x  = 495 (tidak memenuhi)   atau x = 225
HP x = (135, 225)
x1 = 135
x2 = 225
x1 + x2 = 135 +225 = 360