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D( y )
(3/4)*y^4 = 0
(3/4)*y^4 = 0
(3/4)*y^4 = 0
3/4*y^4 = 0 // : 3/4
y^4 = 0
y = 0
y in (-oo:0) U (0:+oo)
((3/4)*y^4)^-2 = 0
16/9*y^-8 = 0 // : 16/9
y^-8 = 0
y należy do O
y belongs to the empty set
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