| #### D.13.6.30 dualConic Procedure from library `tropical.lib` (see tropical_lib). Usage: dualConic(f); f poly Assume: f is an affine conic in two variables x and y Return: poly, the equation of the dual conic Example:
    LIB "tropical.lib";
    ring r=0,(x,y),dp;
    poly conic=2x2+1/2y2-1;
    dualConic(conic);
    ==> 1/2x2+2y2-1

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