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factor (2rx(y^2-r^2)+2ry(x^2-r^2))(z^2-r^2)+2rz((x^2-r^2)(y^2-r^2)-4r^2xy)
factor (2rx(y^2-r^2)+2ry(x^2-r^2))(z^2-r^2)+2rz((x^2-r^2)(y^2-r^2)-4r^2xy)
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