x1^3+x2^3=(x1+x2)(x1^2-x1x2+x2^2)
1/x1+1/x2=(x1+x2)/x1x2
x1^2+x2^2=(x1+x2)^2-2x1x2
X1^3+X2^3=(X1+X2)^3-3X1^2X2-3X1X2^2
1/x1+1/x2=(x1+x2)/x1x2
x1^2+x2^2=(x1+x2)^2-2x1x2
x1^3+x2^3 = (x1+x2)(x1^2-x1x2+x2^2)
1/x1+1/x2 = (x1+x2)/x1x2
x1^2+x2^2=(x1+x2)^2-2x1x2
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