| Exam Board | Edexcel |
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| Module | C4 (Core Mathematics 4) |
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| Year | 2009 |
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| Session | January |
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| Topic | Vectors 3D & Lines |
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4. With respect to a fixed origin \(O\) the lines \(l _ { 1 }\) and \(l _ { 2 }\) are given by the equations
$$l _ { 1 } : \quad \mathbf { r } = \left( \begin{array} { c }