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export default function(pp, arg_r) {
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var r = 2 * Math.cos(arg_r);
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var i = pp.length - 1;
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var hr1 = pp[i];
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var hr2 = 0;
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var hr;
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while (--i >= 0) {
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hr = -hr2 + r * hr1 + pp[i];
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hr2 = hr1;
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hr1 = hr;
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}
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return Math.sin(arg_r) * hr;
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}
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