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D( x )
(8*x^2*x^4*y*y^3)^3 = 0
(8*x^2*x^4*y*y^3)^3 = 0
(8*x^2*x^4*y*y^3)^3 = 0
512*x^18*y^12 = 0 // : 512*y^12
x^18 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^2*(y^2)^5)/((8*x^2*x^4*y*y^3)^3) = 0
1/256*x^-16*y^-2 = 0 // : 1/256*y^-2
x^-16 = 0
x należy do O
x belongs to the empty set
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