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DicksonPoly    --    Dickson polynomial


Syntax 
DicksonPoly(X: RINGELEM, N: INT, ALPHA: RINGELEM): RINGELEM
DicksonPoly2(X: RINGELEM, N: INT, ALPHA: RINGELEM): RINGELEM

Description
These functions return the Dickson polynomials (of 1st and 2nd type respectively) of degree N in X with parameter ALPHA.

Example 
/**/  use QQ[x, alpha];
/**/  DicksonPoly(x, 3, alpha);
x^3 -3*x*alpha