With respect to a fixed origin $$\(O\)$$, the equations of lines $$\(l_{1}\)$$ and $$\(l_{2}\)$$ are given by where $$\(\lambda\)$$ and $$\(\mu\)$$ are scalar parameters. Prove that lines $$\(l_{1}\)$$ and $$\(l_{2}\)$$ are skew. (5)

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