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1/2 = 5/8 − sin A sin B
sin A sin B = 5/8 − 1/2 = 1/8
cos (A − B) = cos A cos B + sin A sin B
= 5/8 + 1/8 = 6/8 = 3/4
coa A-B = cos a dan b + sin A&b =
5/8 +1/8=6/8=3/4