Left align block of equations
Try to use the fleqn
document class option.
\documentclass[fleqn]{article}
(See also http://en.wikibooks.org/wiki/LaTeX/Basics for a list of other options.)
You can use \begin{flalign}
, like the example bellow:
\begin{flalign}
&f(x) = -1.25x^{2} + 1.5x&
\end{flalign}
Try this:
\begin{flalign*}
&|\vec a| = \sqrt{3^{2}+1^{2}} = \sqrt{10} & \\
&|\vec b| = \sqrt{1^{2}+23^{2}} = \sqrt{530} &\\
&\cos v = \frac{26}{\sqrt{10} \cdot \sqrt{530}} &\\
&v = \cos^{-1} \left(\frac{26}{\sqrt{10} \cdot \sqrt{530}}\right) &\\
\end{flalign*}
The &
sign separates two columns, so an &
at the beginning of a line means that the line starts with a blank column.
The fleqn
option in the document class will apply left aligning setting in all equations of the document. You can instead use \begin{flalign}
. This will align only the desired equations.