Minor spelling mistake corrected

On line 144, it was _per_, instead of _pre_
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Amey Bhavsar 2019-10-14 20:04:48 +05:30 committed by GitHub
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@ -141,7 +141,7 @@ Operators are essential parts of a mathematical document:
trigonometric functions ($\sin$, $\cos$, $\tan$),
logarithms and exponentials ($\log$, $\exp$),
limits ($\lim$), etc.\
have per-defined LaTeX commands.
have pre-defined LaTeX commands.
Let's write an equation to see how it's done:
$\cos(2\theta) = \cos^{2}(\theta) - \sin^{2}(\theta)$