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D( x )
18*x^5*y^2 = 0
18*x^5*y^2 = 0
18*x^5*y^2 = 0
18*x^5*y^2 = 0 // : 18*y^2
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x^5*y^7)/(18*x^5*y^2) = 0
1/3*y^5 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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