Cos (A+B) = 2/3
cos (A-B) = 1/2
ditanya : tan A tan B?
cos (A-B) = 1/2
ditanya : tan A tan B?
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tan a . tan b = -cos (a+b) + cos (a-b)/cos (a+b) + cos (a-b)
= -2/3 + 1/2/2/3 + 1/2
= -4/6 + 3/6/4/6 + 3/6
= -1/6/7/6
= -1/7