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D( x )
(8*x^8*y^2)/(x^-2*y^-3) = 0
x = 0
x^-2*y^-3 = 0
(8*x^8*y^2)/(x^-2*y^-3) = 0
(8*x^8*y^2)/(x^-2*y^-3) = 0
8*x^10*y^5 = 0 // : 8*y^5
x^10 = 0
x = 0
x = 0
x = 0
x^-2*y^-3 = 0
x^-2*y^-3 = 0
x^-2*y^-3 = 0 // : y^-3
x^-2 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((8*x^8*y^2)/(x^-2*y^-3))^-1 = 0
1/8*x^-10*y^-5 = 0 // : 1/8*y^-5
x^-10 = 0
x należy do O
x belongs to the empty set
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