bsol doubler and undoubler

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <semantics>
    <mrow>
      <msup>
        <mi>e</mi>
        <mrow data-mjx-texclass="ORD">
          <mi mathvariant="bold-italic">ι</mi>
          <mi>ϑ</mi>
        </mrow>
      </msup>
      <mo>=</mo>
      <mi>cos</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mi>ϑ</mi>
      <mo>+</mo>
      <mi mathvariant="bold-italic">ι</mi>
      <mi>sin</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mi>ϑ</mi>
      <mstyle scriptlevel="0">
        <mspace width="2em"></mspace>
      </mstyle>
      <mstyle mathsize="0.85em" style="
font-weight: bold;
color: darkslateblue;
background: aliceblue;
border: powderblue solid 2px;
border-radius: 2px;
">
        <mstyle displaystyle="false" scriptlevel="0">
          <mtext>Yet another Euler’s formula</mtext>
        </mstyle>
      </mstyle>
    </mrow>
    <annotation encoding="application/x-tex">
e^{\boldsymbol{\iota}\vartheta} = \cos\vartheta + \boldsymbol{\iota}\sin\vartheta
\qquad\style{
font-weight: bold;
color: darkslateblue;
background: aliceblue;
border: powderblue solid 2px;
border-radius: 2px;
}{\small\mbox{Yet another Euler's formula}}
</annotation>
  </semantics>
</math>

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <semantics>
    <mrow>
      <msup>
        <mi>e</mi>
        <mrow data-mjx-texclass="ORD">
          <mi mathvariant="bold-italic">ι</mi>
          <mi>ϑ</mi>
        </mrow>
      </msup>
      <mo>=</mo>
      <mi>cos</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mi>ϑ</mi>
      <mo>+</mo>
      <mi mathvariant="bold-italic">ι</mi>
      <mi>sin</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mi>ϑ</mi>
      <mstyle scriptlevel="0">
        <mspace width="2em"></mspace>
      </mstyle>
      <mstyle mathsize="0.85em" style="
font-weight: bold;
color: darkslateblue;
background: aliceblue;
border: powderblue solid 2px;
border-radius: 2px;
">
        <mstyle displaystyle="false" scriptlevel="0">
          <mtext>Yet another Euler’s formula</mtext>
        </mstyle>
      </mstyle>
    </mrow>
    <annotation encoding="application/x-tex">
e^{\\boldsymbol{\\iota}\\vartheta} = \\cos\\vartheta + \\boldsymbol{\\iota}\\sin\\vartheta
\\qquad\\style{
font-weight: bold;
color: darkslateblue;
background: aliceblue;
border: powderblue solid 2px;
border-radius: 2px;
}{\\small\\mbox{Yet another Euler's formula}}
</annotation>
  </semantics>
</math>

一つ目のテキストエリアのテキストの「\」を「\\」に変換して、二つ目のテキストエリアに表示します。一方で、二つ目のテキストエリアのテキストの「\\」を「\」に変換して一つ目のテキストエリアに表示します。

Converts the text “\” in the first text area to “\\” and displays it in the second text area. On the other hand, the text “\\” in the second text area is converted to “\” and displayed in the first text area.

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Copyleft 🄯 2022 Taiji Yamada <taiji@aihara.co.jp>