| #### D.12.1.7 powerpolyX Procedure from library `aksaka.lib` (see aksaka_lib). Usage: powerpolyX(q,n,a,r); Return: the q-th power of poly a modulo poly r and number n Example:
    LIB "aksaka.lib";
    ring R=0,x,dp;
    poly a=3*x3-x2+5;
    poly r=x7-1;
    bigint q=123;
    bigint n=5;
    powerpolyX(q,n,a,r);
    ==> 3x5+2x4+x3+x2+1

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