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First of all the paper is wrong: the denominator should have $x^3$ instead of $x$. Secondly the parentheses are not placed correctly in your second expression. The following seems to be right:
X3=((x1^3+B)^3-B*x1^3)*(x1^3+B)^(-2)
Y3=(y1^9-y1^3*(x1^3+B)^2)*(x1^3+B)^(-3)
