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PostgreSQL documentation
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<entry><function>atan2</function>(<replaceable>x</replaceable>,
<replaceable>y</replaceable>)</entry>
<entry>inverse tangent of
- <replaceable>a</replaceable>/<replaceable>x</replaceable></entry>
+ <replaceable>x</replaceable>/<replaceable>y</replaceable></entry>
</row>
<row>