${\displaystyle {\underline {i}}={\sqrt {2}}\cdot {\underline {I}}\cdot {\text{e}}^{{\text{j}}\omega t}}$

In your article, replace the image with:

<math>\underline{i}=\sqrt{2}\cdot\underline{I}\cdot\text{e}^{\text{j}\omega t}</math>

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