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