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<a name="Trigonometric-Functions-With-Error-Estimates"></a>
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Previous: <a href="Restriction-Functions.html#Restriction-Functions" accesskey="p" rel="previous">Restriction Functions</a>, Up: <a href="Trigonometric-Functions.html#Trigonometric-Functions" accesskey="u" rel="up">Trigonometric Functions</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Trigonometric-Functions-With-Error-Estimates-1"></a>
<h4 class="subsection">7.31.6 Trigonometric Functions With Error Estimates</h4>

<dl>
<dt><a name="index-gsl_005fsf_005fsin_005ferr_005fe"></a>Function: <em>int</em> <strong>gsl_sf_sin_err_e</strong> <em>(double <var>x</var>, double <var>dx</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><p>This routine computes the sine of an angle <var>x</var> with an associated 
absolute error <var>dx</var>,
<em>\sin(x \pm dx)</em>.  Note that this function is provided in the error-handling form only since
its purpose is to compute the propagated error.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fsf_005fcos_005ferr_005fe"></a>Function: <em>int</em> <strong>gsl_sf_cos_err_e</strong> <em>(double <var>x</var>, double <var>dx</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><p>This routine computes the cosine of an angle <var>x</var> with an associated
absolute error <var>dx</var>, 
<em>\cos(x \pm dx)</em>.  Note that this function is provided in the error-handling form only since
its purpose is to compute the propagated error.
</p></dd></dl>





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