<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\documentclass[a4paper,12pt]{article}
\newcommand\ds{\displaystyle}
\begin{document}

\parindent=0pt

QUESTION

Calculate a unit vector which is parallel to $2{\bf i}-3{\bf
j}+6{\bf k}$.

\bigskip

ANSWER

Unit vector
$\ds=\pm\frac{2\mathbf{i}-3\mathbf{j}+6\mathbf{k}}{\sqrt{2^2+(-3)^2+6^2}}
=\pm\frac{1}{7}(2\mathbf{i}-3\mathbf{j}+6\mathbf{k})$




\end{document}
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