Suppose direction cosines of two lines are given by $u l+v m+w n=0$ and $a l^2+b n^2+c n^2=0$, where

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Suppose direction cosines of two lines are given by $u l+v m+w n=0$ and $a l^2+b n^2+c n^2=0$, where $\mathrm{u}, \mathrm{v}, \mathrm{w}, \mathrm{a}, \mathrm{b}, \mathrm{c}$ are arbitrary constants and $\mathrm{l}, \mathrm{m}, \mathrm{n}$ are direction cosines of the lines.
On the basis of above information, answer the following questions:

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