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<title>GNU Scientific Library &ndash; Reference Manual: Circular Trigonometric Functions</title>

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<a name="Circular-Trigonometric-Functions"></a>
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<p>
Next: <a href="Trigonometric-Functions-for-Complex-Arguments.html#Trigonometric-Functions-for-Complex-Arguments" accesskey="n" rel="next">Trigonometric Functions for Complex Arguments</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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<hr>
<a name="Circular-Trigonometric-Functions-1"></a>
<h4 class="subsection">7.31.1 Circular Trigonometric Functions</h4>

<dl>
<dt><a name="index-gsl_005fsf_005fsin"></a>Function: <em>double</em> <strong>gsl_sf_sin</strong> <em>(double <var>x</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fsin_005fe"></a>Function: <em>int</em> <strong>gsl_sf_sin_e</strong> <em>(double <var>x</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><a name="index-sine-function_002c-special-functions"></a>
<p>These routines compute the sine function <em>\sin(x)</em>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fsf_005fcos"></a>Function: <em>double</em> <strong>gsl_sf_cos</strong> <em>(double <var>x</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fcos_005fe"></a>Function: <em>int</em> <strong>gsl_sf_cos_e</strong> <em>(double <var>x</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><a name="index-cosine-function_002c-special-functions"></a>
<p>These routines compute the cosine function <em>\cos(x)</em>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fsf_005fhypot"></a>Function: <em>double</em> <strong>gsl_sf_hypot</strong> <em>(double <var>x</var>, double <var>y</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fhypot_005fe"></a>Function: <em>int</em> <strong>gsl_sf_hypot_e</strong> <em>(double <var>x</var>, double <var>y</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><a name="index-hypot-function_002c-special-functions"></a>
<p>These routines compute the hypotenuse function <em>\sqrt{x^2 + y^2}</em> avoiding overflow and underflow.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fsf_005fsinc"></a>Function: <em>double</em> <strong>gsl_sf_sinc</strong> <em>(double <var>x</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fsinc_005fe"></a>Function: <em>int</em> <strong>gsl_sf_sinc_e</strong> <em>(double <var>x</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><a name="index-complex-sinc-function_002c-special-functions"></a>
<p>These routines compute <em>\sinc(x) = \sin(\pi x) / (\pi x)</em> for any
value of <var>x</var>.
</p></dd></dl>




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