Sin 3/4 pi . Sin pi/4 + cos 3/4 pi . Cos pi/4
Matematika
Bellabelia
Pertanyaan
Sin 3/4 pi . Sin pi/4 + cos 3/4 pi . Cos pi/4
1 Jawaban
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1. Jawaban Anonyme
Bab Trigonometri
Matematika SMA Kelas X
sin 3π/4 . sin π/4 + cos 3π/4 . cos π/4
= cos (3π/4 - π/4)
= cos 2π/4
= 0