<?xml version="1.0" encoding="utf-8"?>
<!--
 * Ajouter ici d'éventuels commentaires sur le fichier XML
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:ns3="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:id="acsc" xml:lang="pt">
    <refnamediv>
        <refname>acsc</refname>
        <refpurpose>computa o arco-cossecante elemento a elemento do
            argumento
        </refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Seqüência de Chamamento</title>
        <synopsis>y = acsc(x)</synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Parâmetros</title>
        <variablelist>
            <varlistentry>
                <term>x</term>
                <listitem>
                    <para>array de reais ou complexos</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>y</term>
                <listitem>
                    <para>array de reais ou complexos</para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Descrição</title>
        <para>computa o arco-cossecante elemento a elemento do argumento. Para
            entradas com valores reais absolutos maiores que 1, o resultado é
            real.
        </para>
        <para>
            As seguintes desigualdades se verificam: <literal>acsc(z) =
                -acsc(-z) = asin(1/z) = %pi/2-asec(z) = %i*acsch(%i*z)
            </literal>
        </para>
    </refsection>
    <refsection>
        <title>Exemplos</title>
        <programlisting role="example"><![CDATA[
x=linspace(1,20,200);
x=[-x($:-1:1) %nan x];
plot(x,acsc(x))
 ]]></programlisting>
    </refsection>
    <refsection>
        <title>Ver Também</title>
        <simplelist type="inline">
            <member>
                <link linkend="acscd">acscd</link>
            </member>
            <member>
                <link linkend="csc">csc</link>
            </member>
            <member>
                <link linkend="cscd">cscd</link>
            </member>
            <member>
                <link linkend="acsch">acsch</link>
            </member>
        </simplelist>
    </refsection>
    <refsection>
        <title>Referências</title>
        <simplelist type="vert">
            <member>Kahan, W., "Branch cuts for complex elementary functions, or,
                Much ado about nothing's sign bit", Proceedings of the joing IMA/SIAM
                conference on The State of the Art in Numerical Analysis, University of
                Birmingham, A. Iserles and M.J.D. Powell, eds, Clarendon Press, Oxford,
                1987, 165-210.
            </member>
        </simplelist>
    </refsection>
</refentry>
