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<head><title>acosh3</title>
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<body>
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  <mrow>
    <mtext>acosh</mtext>
    <mfenced>
      <mrow>
        <mi>x</mi>
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    <mo>=</mo>
    <mtext>log1p</mtext>
    <mfenced>
      <mrow>
        <mi>y</mi>
        <mo>+</mo>
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            <msup>
              <mi>y</mi>
              <mn>2</mn>
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            <mn>2</mn>
            <mi>y</mi>
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    <mspace width="1em"/>
    <mo>;</mo>
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    <mi>y</mi>
    <mo>=</mo>
    <mi>x</mi>
    <mo>&#x2212;</mo>
    <mn>1</mn>
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