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D( x )
x < 0
56*x^(5/6)*y^(1/4) = 0
x < 0
56*x^(5/6)*y^(1/4) = 0
56*x^(5/6)*y^(1/4) = 0
56*x^(5/6)*y^(1/4) = 0 // : 56*y^(1/4)
x^(5/6) = 0
x = 0
x in (0:+oo)
(14*x^(1/2)*y^(1/8))/(56*x^(5/6)*y^(1/4)) = 0
1/4*x^(-1/3)*y^(-1/8) = 0 // : 1/4*y^(-1/8)
x^(-1/3) = 0
x należy do O
x belongs to the empty set
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