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This question already has an answer here:

I just started learning LaTeX, and I'm having trouble to write a symbol, LaTeX.

enter image description here

marked as duplicate by Martin Thoma, Paul Gessler, Werner, Guido, Jesse Aug 2 '14 at 1:36

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Just write it as follows:

\documentclass[12pt,a4paper]{article}
\begin{document}
\LaTeX
\end{document}

The output is:

enter image description here

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