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<h4 class="subsection">16.1.2 Integrands with weight functions</h4>
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<p><a name="index-Clenshaw_002dCurtis-quadrature-1345"></a><a name="index-Modified-Clenshaw_002dCurtis-quadrature-1346"></a>For integrands with weight functions the algorithms use Clenshaw-Curtis
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<p>A Clenshaw-Curtis rule begins with an n-th order Chebyshev
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polynomial approximation to the integrand. This polynomial can be
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integrated exactly to give an approximation to the integral of the
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original function. The Chebyshev expansion can be extended to higher
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orders to improve the approximation and provide an estimate of the