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<head><title>complex_bessel_k_integral</title>
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    <msub>
      <mi>K</mi>
      <mi>&#x3b1;</mi>
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        <mi>x</mi>
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    <mo>=</mo>
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      <mo>&#x222b;</mo>
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        <mi>o</mi>
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      <mi>e</mi>
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        <mo>&#x2212;</mo>
        <mi>x</mi>
        <mtext>cosh</mtext>
        <mfenced>
          <mrow>
            <mi>t</mi>
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    <mtext>cosh</mtext>
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        <mi>&#x3b1;</mi>
        <mi>t</mi>
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    <mi>d</mi>
    <mi>t</mi>
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