DB45
Cos 1/2 x = cos 15 1/2 x = 15 + k. 360 atau 1/2 x = -15 + k. 360 x = 30 + k.720 atau x = -30 + k. 720 k = 0 --> x₁ = 30 , x₂ = - 30 k = 1 --> x₃ = 750 (TM) , x₄ = 690 (TM) HP x = {-30, 30}
tan (3t - 180) = -1 = - tan 45 = tan (180- 45) = tan 135 3t - 180 = 135 + k. 180 3t = 315 + k. 180 t = 105 + k. 60 k = 0 , t = 105 k =1 , t = 165 k = 2 , t = 225 k = 3 , t = 285 k = 4 , t = 345 .. t = (105, 165, 225, 285, 345)
1/2 x = 15 + k. 360 atau 1/2 x = -15 + k. 360
x = 30 + k.720 atau x = -30 + k. 720
k = 0 --> x₁ = 30 , x₂ = - 30
k = 1 --> x₃ = 750 (TM) , x₄ = 690 (TM)
HP x = {-30, 30}
tan (3t - 180) = -1 = - tan 45 = tan (180- 45) = tan 135
3t - 180 = 135 + k. 180
3t = 315 + k. 180
t = 105 + k. 60
k = 0 , t = 105
k =1 , t = 165
k = 2 , t = 225
k = 3 , t = 285
k = 4 , t = 345
..
t = (105, 165, 225, 285, 345)