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<head><title>atanh2</title>
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    <mtext>atanh</mtext>
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        <mi>x</mi>
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    <mo>&#x2248;</mo>
    <mi>x</mi>
    <mo>+</mo>
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    <mo>;</mo>
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    <mi>x</mi>
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      <mi>&#x03B5;</mi>
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