Diketahui cos (A+B)= 2/3 dan cos (A-B)=1/2. Nilai cos A cos B =..
Matematika
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Pertanyaan
Diketahui cos (A+B)= 2/3 dan cos (A-B)=1/2. Nilai cos A cos B =..
1 Jawaban
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1. Jawaban Blankxx
cos (a + b) = 2/3
cos (a - b) = 1/2
cos a cos b - sin a sin b = 2/3
cos a cos b + sin a sin b = 1/2
------------------------------------------- ( + )
2 cos a cos b = 7/6
cos a cos b = 7/12