${\displaystyle {\begin{aligned}\left\vert {\frac {V_{0}}{V_{in}}}\right\vert &=20\log \left[{\frac {R_{2}}{R_{1}+R_{2}}}{\sqrt {1+\left({\frac {f}{f_{c}}}\right)^{2}}}\right]\\f_{c}&=2125\ {\text{Hz}}\end{aligned}}}$

In your article, replace the image with:

<math>\begin{align}
\left \vert \frac{V_0}{V_{in} } \right \vert & = 20 \log \left[\frac{R_2}{R_1+R_2}\sqrt{1+\left(\frac{f}{f_c}\right)^2}\right] \\
f_c & = 2125\ \text{Hz}
\end{align}</math>

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