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D( x )
x = 0
((8*x^-9)/27)*y^15 = 0
x = 0
x = 0
((8*x^-9)/27)*y^15 = 0
((8*x^-9)/27)*y^15 = 0
8/27*x^-9*y^15 = 0 // : 8/27*y^15
x^-9 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((((8*x^-9)/27)*y^15)^-1)/3 = 0
9/8*x^9*y^-15 = 0 // : 9/8*y^-15
x^9 = 0
x = 0
x in { 0}
x belongs to the empty set
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