If I have two rational function mappings : f(x,y): (x,y )------>( x^2+15x-2 / x+15, x^2y+xy+y / x^2+30x-1 ); g(x,y): (x,y )------>( x^2+20x-18 / x+20, x^2y+xy+32y / x^2-31x+14 );
how to compute the f(g(x,y)) with sagemath?
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