u=x^2+y^2,/hspace{1em}v=x(x^2-3y^2)
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  1. http://formula.s21g.com/?u=x%5E2+y%5E2,/hspace%7B1em%7Dv=...
  2. http://formula.s21g.com/?u=x%5e2+y%5e2%2c/hspace%7b1em%7d...