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m.g = -2/3
maka,
tan a = (m.g-m.l) / (1 + m.l x m.g)
tan a = (-2/3 - 5/3) / (1 + 5/3 x -2/3)
tan a = (-7/3) / (-7/3)
tan a = 1
a = 45 derajat