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D( R )
2*R = 0
2*R = 0
2*R = 0
2*R = 0 // : 2
R = 0
R in (-oo:0) U (0:+oo)
(R^2)/(2*R) = 0
1/2*R = 0 // : 1/2
R = 0
R in { 0}
R belongs to the empty set
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