reference/math/functions/atan.xml
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Returns the arc tangent of <parameter>num</parameter> in radians.
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<function>atan</function> is the inverse function of
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<function>tan</function>, which means that
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<literal>a==tan(atan(a))</literal> for every value of a that is within
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<function>atan</function>'s range.
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<code>$num == tan(atan($num))</code> for every value of
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<parameter>num</parameter> that is in
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the domain of <function>atan</function>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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