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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
((0.5*x^-0.5)/0.5)*y^-0.5 = 0
x^-0.5*y^-0.5 = 0 // : y^-0.5
x^-0.5 = 0
x naleu017Cy do O
x belongs to the empty set
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