29.9 Mathematical functions for floating-point types [c.math]
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:
where
l is l and
x is x.
Remarks:
The effect of calling each of these functions
is
implementation-defined
if
l >= 128.