cos 10 / cos 40.cos 50 =
Matematika
blackfire97
Pertanyaan
cos 10 / cos 40.cos 50 =
1 Jawaban
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1. Jawaban Anonyme
Trigonometri
cos a cos b = 1/2 (cos (a + b) + cos (a - b))
cos 10 / cos 50 cos 40
= cos 10 / 1/2 (cos 90 + cos 10)
= 2 cos 10 / cos 10
= 2