2r^2/r

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Solution for 2r^2/r equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

(2*r^2)/r = 0

2*r = 0 // : 2

r = 0

r in { 0} 

r belongs to the empty set

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