How to use big phi(Φ) symbol in LaTeX?

Symbol/UnicodeBig Phi/U+03A6
Type of symbolGreek capital letter
Package (requirement)No
ArgumentNo
Latex command\Phi
Example\Phi → Φ
\documentclass{article}
\begin{document}
   \[ \Phi_n (X) \]
   \[ \frac{1}{\Phi} =\Phi + 1 \]
   \[ \langle\Phi|\psi\rangle \]
\end{document}

Output :

Use big phi symbol in latex.

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