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D( y )
4*y^3 = 0
4*y^3 = 0
4*y^3 = 0
4*y^3 = 0 // : 4
y^3 = 0
y = 0
y in (-oo:0) U (0:+oo)
(12*y^7-8^4)/(4*y^3) = 0
(12*y^7-4096)/(4*y^3) = 0
12*y^7 = 4096 // : 12
y^7 = 1024/3
y^7 = 1024/3 // ^ 1/7
y = (1024/3)^(1/7)
y = (1024/3)^(1/7)
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