Let L 1 and L 2 be the lines of slope m 1 and m 2 [Figure
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Let L1 and L2 be the lines of slope m1 and m2 [Figure 28(B)]. Show that the angle θ between L1 and L2 satisfies cot θ = m2m1 + 1/m2 −m1.
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L2 L₁ X
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