Sederhanakan! Sin(phi/4 + A) sin(phi/4 - A)
Matematika
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Pertanyaan
Sederhanakan!
Sin(phi/4 + A) sin(phi/4 - A)
Sin(phi/4 + A) sin(phi/4 - A)
1 Jawaban
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1. Jawaban Anonyme
Trigonometri
2 sin a sin b = cos (a - b) - cos (a + b)
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sin (π/4 + A) sin (π/4 - A)
= 1/2 (cos 2A - cos π/2)
= 1/2 cos 2A