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Showing content from https://timsong-cpp.github.io/cppwp/n4659/sf.cmath.legendre below:

[sf.cmath.legendre]

29 Numerics library [numerics] 29.9 Mathematical functions for floating-point types [c.math] 29.9.5 Mathematical special functions [sf.cmath] 29.9.5.17 Legendre polynomials [sf.cmath.legendre]

double legendre(unsigned l, double x); float legendref(unsigned l, float x); long double legendrel(unsigned l, long double x);

Effects: These functions compute the Legendre polynomials of their respective arguments l and x.

Returns:

P(x)=12!ddx(x21),for |x|1

where l is l and x is x.

Remarks: The effect of calling each of these functions is implementation-defined if l >= 128.


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