cos 70° + cos 20° / sin 70° + sin 20°
Matematika
annisaoliviasav
Pertanyaan
cos 70° + cos 20° / sin 70° + sin 20°
1 Jawaban
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1. Jawaban Anonyme
Kelas 11 Matematika
Bab Trigonometri Lanjut
(cos 70° + cos 20°) / (sin 70° + sin 20°)
= (2 cos ((70° + 20°)/2) . cos ((70° - 20°)/2) / (2 sin ((70° + 20°)/2) . cos ((70° - 20°)/2)
= (cos 45°)/(sin 45°)
= (1/2 √2) / (1/2 √2)
= 1