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D( x )
((8*x^12*y^-3)/(y^6))*z^3 = 0
y^6 = 0
((8*x^12*y^-3)/(y^6))*z^3 = 0
((8*x^12*y^-3)/(y^6))*z^3 = 0
8*x^12*y^-9*z^3 = 0 // : 8*y^-9*z^3
x^12 = 0
x = 0
y^6 = 0
y^6 = 0
y^6 = 0
x naleu017Cy do R
x belongs to the empty set
((((8*x^12*y^-3)/(y^6))*z^3)^-4)/3 = 0
x belongs to the empty set
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