__Function:__int**gsl_poly_solve_cubic***(double*`a`, double`b`, double`c`, double *`x0`, double *`x1`, double *`x2`)-
This function finds the real roots of the cubic equation,

with a leading coefficient of unity. The number of real roots (either one or three) is returned, and their locations are stored in

`x0`,`x1`and`x2`. If one real root is found then only`x0`is modified. When three real roots are found they are stored in`x0`,`x1`and`x2`in ascending order. The case of coincident roots is not considered special. For example, the equation @math{(x-1)^3=0} will have three roots with exactly equal values.

__Function:__int**gsl_poly_complex_solve_cubic***(double*`a`, double`b`, double`c`, gsl_complex *`z0`, gsl_complex *`z1`, gsl_complex *`z2`)-
This function finds the complex roots of the cubic equation,

The number of complex roots is returned (always three) and the locations of the roots are stored in

`z0`,`z1`and`z2`. The roots are returned in ascending order, sorted first by their real components and then by their imaginary components.

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