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D( x )
42*r^4 = 0
6*r = 0
42*r^4 = 0
42*r^4 = 0
42*r^4 = 0
x naleu017Cy do R
6*r = 0
6*r = 0
6*r = 0
x naleu017Cy do R
x belongs to the empty set
(5*t^2)/(6*r) = X/(42*r^4)
x belongs to the empty set
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