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Direction Cosines

Find the dire...

Question

Find the direction cosines of the line PQ joining the points $P (2, 3, 4)$ and $Q (2, 1, 1)$ .

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Solution

$\begin{matrix} D i r e c t i o n cos i n e s o f t h e l i n e P Q i s (0, - 2, - 3) \end{matrix}$

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