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D( x )
((3*x^2)/4)*y = 0
((3*x^2)/4)*y = 0
((3*x^2)/4)*y = 0
3/4*x^2*y = 0 // : 3/4*y
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((3*x^2)/4)*y)^-3 = 0
64/27*x^-6*y^-3 = 0 // : 64/27*y^-3
x^-6 = 0
x należy do O
x belongs to the empty set
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