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Kunci Jawaban dan Pembahasan

Kunci Jawaban Soal Latihan Bentuk Essay

1. tan(2 − 35°) = 1, 0° ≤ ≤ 360°
(SKOR MAKSIMUM 10)
2 − 35° = 45° + . 180°
2 = 80° + . 180°
= 40° + . 90° (untuk bilangan bulat)
1 = 40°
2 = 40° + 90° = 130°
3 = 40° + 180° = 220°
4 = 40° + 270° = 310°
HP = {40°,130°,220°,310°}

2. tan(3 − 15°) = −1, 0° ≤ ≤ 180°
(SKOR MAKSIMUM 10)
(3 − 15°) = 135° + . 180°
3 = 150° + . 180°
= 50° + . 60°
1 = 50°
2 = 50° + 60° = 110°
3 = 50° + 120° = 170°
HP = {60°, 110°, 170°}

3. 2 cos (2 − ) − ξ3 = 0, 0 ≤ ≤ 2
3
(SKOR MAKSIMUM 15)

2 cos (2 − ) = ξ3
3
1
cos (2 − ) = ξ3
3 2
Kosinus Positif di Kuadran I

2 − = + . 2
3 6

2 = + + . 2
3 6

2 = 2 + . 2

= + .
4

1 = + 0. =
4 4
5
2 = + 1. =
4 4
Kosinus Positif di Kuadran IV

2 − = − + . 2
3 6

2 = + . 2
6

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