ext-align:right;">31</td>
      <td style="text-align:center;">&#128522;</td>
      <td style="text-align:left;">$${\bold e}(\varphi) = \begin{pmatrix}
\cos\varphi\\\sin\varphi
\end{pmatrix}$$ (3)</td>
      <td style="text-align:left;"><section class="eqno"><eqn><span class="katex-display"><span class="katex"><span class="katex-mathml"><math><semantics><mrow><mrow><mi mathvariant="bold">e</mi></mrow><mo>(</mo><mi>φ</mi><mo>)</mo><mo>=</mo><mrow><mo fence="true">(</mo><mtable><mtr><mtd><mrow><mi>cos</mi><m