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L2 = x + 4 ----> m2 = 1
tan (q) = | (m1 - m2)/(1 - m1.m2) |
tan (q) = | (3 - 1)/(1 - 3.1) |
tan (q) = | 2 / -2 |
tan (q) = |-1|
tan(q) = 1
q = 45 derajat