File:Formula5.png

${\displaystyle H\cdot {\frac {\mathrm {d} }{\mathrm {d} S}}\left({\frac {\sin \alpha }{\cos \alpha }}\right)-q=0\ {\textrm {sau}}\ {\frac {\mathrm {d} }{\mathrm {d} S}}\left({\frac {\mathrm {d} y}{\mathrm {d} x}}\right)={\frac {q}{H}}={\frac {1}{c}}\ {\textrm {unde}}\ c={\frac {H}{q}}}$

In your article, replace the image with:

<math>H\cdot\frac{\mathrm{d} }{\mathrm{d}S}\left(\frac{\sin\alpha}{\cos\alpha}\right)-q=0 \ \textrm{sau} \ \frac{\mathrm{d} }{\mathrm{d}S}\left(\frac{\mathrm{d}y}{\mathrm{d}x}\right)=\frac{q}{H}=\frac{1}{c} \ \textrm{unde} \ c=\frac{H}{q}</math>

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