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D( x )
x = 0
-12*x^-5*y^8*z^8 = 0
x = 0
x = 0
-12*x^-5*y^8*z^8 = 0
-12*x^-5*y^8*z^8 = 0
-12*x^-5*y^8*z^8 = 0 // : -12*y^8*z^8
x^-5 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(4*x^-2*y^-5*z^-2)/(-12*x^-5*y^8*z^8) = 0
-1/3*x^3*y^-13*z^-10 = 0 // : -1/3*y^-13*z^-10
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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