How to use eta(η) symbol in LaTeX?

Symbol/UnicodeEta/U+03B7
Type of symbolGreek letter
Package (requirement)No
ArgumentNo
Latex command\eta
Example\eta → η

When you need to write the eta symbol in equations, just type \eta inside math mode. It will automatically print the symbol η. You don’t need any extra package or arguments for this.

\documentclass{article}
\begin{document}
   \[ \eta^2 = \frac{SS_b}{SS_t} \]
   \[ \eta = \pm 1 \]
   \[ \frac{d}{d\eta}\left[(1-\eta^2)\frac{d}{d\eta}S_{mn}(\eta)\right] \]
\end{document}

Output :

Use eta symbol in latex.
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