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D( x )
2*x^2*z^10 = 0
2*x^2*z^10 = 0
2*x^2*z^10 = 0
2*x^2*z^10 = 0 // : 2*z^10
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^4*y^2*z^6)^3)/(2*x^2*z^10) = 0
4*x^10*y^6*z^8 = 0 // : 4*y^6*z^8
x^10 = 0
x = 0
x in { 0}
x belongs to the empty set
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