2 cos(85,5) cos(4,5) derajat
Matematika
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Pertanyaan
2 cos(85,5) cos(4,5) derajat
1 Jawaban
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1. Jawaban Anonyme
TriGonoMetRi
2 cos a cos b = cos (a+b) + cos (a-b)
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2 cos 85,5 cos 4,5
= cos 90° + cos 81°
= cos 81° ✔