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poly() Generate a Polynomial from Arguments
#include <math.h>
double poly(x,n,c);
double x;
int n;
double c[];
poly() generates a polynomial in 'x', of degree 'n', with
coefficients c[0], c[1],...,c[n]. For example, if n = 4, the
generated polynomial is
c[4]x4 + c[3]x3 + c[2]x2 + c[1]x + c[0]
Returns: The value of the polynomial as evaluated for 'x'.
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