Use Exercise 66 to prove that two lines with nonzero slopes m 1 and m 2 are
Question:
Use Exercise 66 to prove that two lines with nonzero slopes m1 and m2 are perpendicular if and only if m2 = −1/m1.
Data From Exercise 66
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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