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D( x )
x < 0
x = 0
x^(1/4)*y^(-5/6) = 0
x^-3*y^(1/5) = 0
x < 0
x = 0
x = 0
x^(1/4)*y^(-5/6) = 0
x^(1/4)*y^(-5/6) = 0
x^(1/4)*y^(-5/6) = 0 // : y^(-5/6)
x^(1/4) = 0
x = 0
x^-3*y^(1/5) = 0
x^-3*y^(1/5) = 0
x^-3*y^(1/5) = 0 // : y^(1/5)
x^-3 = 0
x należy do O
x in (0:+oo)
((x^-3*y^(1/5))^(-2/3))/(x^(1/4)*y^(-5/6)) = 0
x^(7/4)*y^(7/10) = 0 // : y^(7/10)
x^(7/4) = 0
x = 0
x in { 0}
x belongs to the empty set
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