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