Nilai sin 105 derajat sin 75 derajat =
Matematika
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Pertanyaan
Nilai sin 105 derajat sin 75 derajat =
1 Jawaban
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1. Jawaban Anonyme
TriGonoMetRi
2 sin a sin b = cos (a - b) - cos (a + b)
sin 105 sin 75
= 1/2 (cos (105 - 75) - cos (105 + 75))
= 1/2 (cos 30° - cos 180°)
= 1/2 (1/2 √3 + 1)
= 1/4 (√3 + 2)