Solusi 1. 2x = 60 + k.360 x = 30 + k.180 Dengan k = 0, k = 1 Didapat: x = {30, 210}
Solusi 2. 2x = (180-60) + k.360 2x = 120 + k.360 x = 60 + k.180 Dengan k = 0, k = 1 Didapat: x = {60,240}
Sehingga, HP = {x | 30, 60, 210, 240}
Nomor 2. Penjabaran umum:
sin x = 1 Memiliki solusi hanya x = {90}
Nomor 3. Rumus.
Sehingga,
Solusi 1. cos 2x = 0 2x = 90 + k.360 x = 45 + k.180 Didapat x = {45,225}
Solusi 2. 2x = -90 + k.360 x = -45 + k.180 Didapat x = {135, 315}
Solusi 3. sin x = 0 x = {0,180,360}
Sehingga, selesaian: x = {0,45,135,180,225,315,360}
Nomor 4. cos 2x + sin x = 0 1 - 2sin²x + sin x = 0 2sin²x - sin x - 1 = 0 (2sin x + 1)(sin x - 1) = 0 Maka, 2sin x + 1 = 0 sin x = -1/2 Didapat x = {210,330}
sin x - 1 = 0 sin x = 1 Didapat x = {90}
HP = {x | 90, 210, 330}
Nomor 5. p cos x+6 sin x = 10 Interval untuknya 0 ≤ sin x, cos x ≤ 1 Maka,
Dalam selang minimal sin x = 0 Maka, 100 - p² = 0 p = -10 dan p = 10 Dalam selang maksimal sin x = 1 36+p²-120+100-p² = 0 Tidak sama, sehingga. p = -10 dan p = 10 *. Mungkin soal sedikit bermasalah.
Sehingga,
Solusi 1.
2x = 60 + k.360
x = 30 + k.180
Dengan k = 0, k = 1
Didapat:
x = {30, 210}
Solusi 2.
2x = (180-60) + k.360
2x = 120 + k.360
x = 60 + k.180
Dengan k = 0, k = 1
Didapat:
x = {60,240}
Sehingga,
HP = {x | 30, 60, 210, 240}
Nomor 2.
Penjabaran umum:
sin x = 1
Memiliki solusi hanya x = {90}
Nomor 3.
Rumus.
Sehingga,
Solusi 1.
cos 2x = 0
2x = 90 + k.360
x = 45 + k.180
Didapat x = {45,225}
Solusi 2.
2x = -90 + k.360
x = -45 + k.180
Didapat x = {135, 315}
Solusi 3.
sin x = 0
x = {0,180,360}
Sehingga, selesaian:
x = {0,45,135,180,225,315,360}
Nomor 4.
cos 2x + sin x = 0
1 - 2sin²x + sin x = 0
2sin²x - sin x - 1 = 0
(2sin x + 1)(sin x - 1) = 0
Maka,
2sin x + 1 = 0
sin x = -1/2
Didapat x = {210,330}
sin x - 1 = 0
sin x = 1
Didapat x = {90}
HP = {x | 90, 210, 330}
Nomor 5.
p cos x+6 sin x = 10
Interval untuknya 0 ≤ sin x, cos x ≤ 1
Maka,
Dalam selang minimal sin x = 0
Maka,
100 - p² = 0
p = -10 dan p = 10
Dalam selang maksimal sin x = 1
36+p²-120+100-p² = 0
Tidak sama, sehingga.
p = -10 dan p = 10
*. Mungkin soal sedikit bermasalah.