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TAN A = 12/5 (lancip)
TAN B = - 4/3 (tumpul)
Tan a - tan b/1 + tan a tan b
12/5 + 4/3 / 1 + (12/5 x -4/3)
= 36/15 + 20/15 / -48/15
= 56/15 x -15/48
= - 56/48
= - 7/6