Berapa Nilai sin 165°?
Matematika
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Pertanyaan
Berapa Nilai sin 165°?
1 Jawaban
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1. Jawaban eripane05
Trigonometri
sin 165
= sin (120 + 45)
= sin 120 cos 45 + cos 120 sin 45
= 1/2 √3 (1/2 √2) + (-1/2) (1/2 √2)
= 1/4 √6 - 1/4 √2
= 1/4 (√6 -√2)