X + y+z whole cube minus x cube minus y cube minus z cube
Anonymous:
___k off
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(X+y+z)^3-x^3-y^3-z^3
=
(x^3 + y^3 + z^3 + 3x^2y + 3xy^2
+ 3x^2z + 3z^2x + 3y^2z + 3z^2y + 6xyz)-x^3-y^3-z^3
=
3x^2y + 3xy^2
+ 3x^2z + 3z^2x + 3y^2z + 3z^2y + 6xyz
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