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#### Laguerre polynomials <a id="sf.cmath.laguerre">[[sf.cmath.laguerre]]</a>
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``` cpp
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double laguerre(unsigned n, double x);
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float laguerref(unsigned n, float x);
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long double laguerrel(unsigned n, long double x);
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```
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*Effects:* These functions compute the Laguerre polynomials of their
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respective arguments `n` and `x`.
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*Returns:* $$%
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\mathsf{L}_n(x) =
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\frac{e^x}{n!} \frac{ \mathsf{d} ^ n}
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{ \mathsf{d}x ^ n} \, (x^n e^{-x}),
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\quad \mbox{for $x \ge 0$}$$ where n is `n` and x is `x`.
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*Remarks:* The effect of calling each of these functions is
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*implementation-defined* if `n >= 128`.
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