2sin(A+B-C)sin(A-B+C)
Matematika
sRatnaa
Pertanyaan
2sin(A+B-C)sin(A-B+C)
1 Jawaban
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1. Jawaban Anonyme
2 sin (A + B - C) sin (A - B + C)
= -(cos (A + B - C + A - B + C) - cos (A + B - C - A + B - C)
= - cos 2A + cos 2(B + C)