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D( x )
9*m^4*n^9 = 0
5*m = 0
9*m^4*n^9 = 0
9*m^4*n^9 = 0
9*m^4*n^9 = 0
x należy do R
5*m = 0
5*m = 0
5*m = 0
x należy do R
x belongs to the empty set
(8*((2*m^9*n^2)/(5*m))*n^4)/(9*m^4*n^9) = 0
x belongs to the empty set
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