x_1, x_2, 
2*x_1*(3*x_1^4+2*x_1^2*x_2^2+x_2^4+5000*x_1^2+6250000)
2*x_2*(x_1^4+2*x_1^2*x_2^2+3*x_2^4+5000*x_2^2+6250000)
