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Jika A + B = π/3 dan cos A cos B = 5/8. Maka cos (A + B) =

Jika A + B = π/3 dan cos A cos B = 5/8. Maka cos (A + B) = …. 

Pembahasan:

A + B = π/3

cos A cos B = 5/8

cos (A + B) = … ?


cos (A + B) = cos (π/3) = ½ 

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