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sin a = de/mi = 3/5
brarti cos a = sa/mi = 4/5
tan b = de/sa = 8/15
berarti
sin b = de/mi = 8/17
cos b = sa/mi = 15/17
cos (a - b) =
cos a cos b + sin a sin b =
4/5.15/17 + 3/5.8/17 =
60/85 + 24/85 =
84/85