/usr/share/help/it/mate-calc/power.page is in mate-calc-common 1.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<page xmlns="http://projectmallard.org/1.0/" type="guide" id="power" xml:lang="it">
<info>
<link type="guide" xref="index#equation"/>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Paolo Stivanin</mal:name>
<mal:email>paolostivanin@yahoo.it</mal:email>
<mal:years>2010</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Luca Ferretti</mal:name>
<mal:email>lferrett@gnome.org</mal:email>
<mal:years>2012</mal:years>
</mal:credit>
</info>
<title>Powers and Roots</title>
<p>
Powers are entered by putting a <link xref="superscript">superscript number</link> after the value.
</p>
<example>
<p>
5²
</p>
</example>
<p>
The inverse of a number can be entered using the inverse symbol ⁻¹ (<keyseq><key>Ctrl</key><key>I</key></keyseq>).
</p>
<example>
<p>
3⁻¹
</p>
</example>
<p>
Powers can also be calculated using the ^ symbol.
This allows the power to be an equation.
</p>
<example>
<p>
5^(6−2)
</p>
</example>
<p>
If your keyboard does not have a <key>^</key> key you can use <key>*</key> twice.
</p>
<p>
Square roots can be calculated using the symbol (<keyseq><key>Ctrl</key><key>R</key></keyseq>).
</p>
<example>
<p>
√2
</p>
</example>
<p>
n-th roots can be calculated by putting a <link xref="superscript">subscript number</link> before the root sign.
</p>
<example>
<p>
₃√2
</p>
</example>
</page>
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