sin 3/4π x sin π/4+cos3/4πx cos π/4
Matematika
aseva
Pertanyaan
sin 3/4π x sin π/4+cos3/4πx cos π/4
1 Jawaban
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1. Jawaban Anonyme
Kelas 10 Matematika
Bab Trigonometri
sin 3π/4 . sin π/4 + cos 3π/4 . cos π/4
= cos 3π/4 . cos π/4 + sin 3π/4 . sin π/4
= cos (3π/4 - π/4)
= cos (2π/4)
= cos (π/2)
= 0