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I have got the following TeX equation:

 \[r(t)=\frac{l}{1+e\cos \theta (t)}\]

Now I could not use this in Texmaker. To show the same equation Texmaker wants

$ r(t )= \dfrac{l}{ 1+e cos \theta (t)} $\\

So what should I do?

  • Welcome to TeX.sx! A tip: If you indent lines by 4 spaces, they'll be marked as a code sample. You can also highlight the code and click the "code" button (with "{}" on it). – Corentin Nov 15 '12 at 13:35
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    I am not sure I understand your problem: the first equation should compile fine. You should remove the \` in the second equation, and use \cos` also here. Could you please provide a minimal working example (MWE) that illustrates your problem, including your preamble (\dfrac is defined in the amsmath package). – Corentin Nov 15 '12 at 13:38
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The following compiles perfectly in Texmaker:

\documentclass{article}
\usepackage{amsmath,amssymb}

\begin{document}
\[r(t)=\frac{l}{1+e\cos \theta (t)}\]
\end{document}

This yields:

enter image description here

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