hitung nilai 5 cos 285 sin 15
Matematika
mawar2210
Pertanyaan
hitung nilai 5 cos 285 sin 15
1 Jawaban
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1. Jawaban Anonyme
TriGonoMetRi
2 cos a sin b = sin (a + b) - sin (a - b)
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5 cos 285 sin 15
= 5 . 1/2 . 2 cos 285 sin 15
= 5/2 (sin (285 + 15) - sin (285 - 15))
= 5/2 (sin 300° - sin 270°)
= 5/2 (-1/2 √3 - (-1))
= 5/2 (1 - 1/2 √3)
= 5/4 (2 - √3) ✔