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D( x )
m^2*r^-2*s^4 = 0
m^2*r^-2*s^4 = 0
m^2*r^-2*s^4 = 0
m^2*r^-2*s^4 = 0
x należy do R
x belongs to the empty set
((-(2*m^3)-6*r^2)^2)/(m^2*r^-2*s^4) = 0
x belongs to the empty set
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