Jika sin (a + b) = 4/5, cos (a - b) = 12/13, dan 0 < a, b <

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Jika sin (a + b) = 4/5, cos (a - b) = 12/13, dan 0 < a, b < pi/4, maka tan (2a) =
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Jika sin (a + b) = 4/5, cos (a - b) = 12/13, dan 0 < a, b < pi/4, maka tan (2a) =