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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4^(-1/2)*x^(4*(-1/2))*y^(3*(-1/2)) = 0
1/2*x^-2*y^(-3/2) = 0 // : 1/2*y^(-3/2)
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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