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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-5*((4*x^5*y^2)/16))^1)/2 = 0
(x^-5*((4*x^5*y^2)/16))/2 = 0
1/8*y^2 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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