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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
((2*n^-2)/3)*((n^8)/3-((3*n^5)/3)) = 0
((2*n^-2)/3)*((n^8)/3-n^5) = 0
2/3*n^-2*(1/3*n^8-n^5) = 0
1/3*n^8-n^5 = 0
n^5*(1/3*n^3-1) = 0
1/3*n^3 = 1 // : 1/3
n^3 = 3
n^3 = 3 // ^ 1/3
n = 3^(1/3)
n^5*(n-3^(1/3)) = 0
2/3*n^-2*n^5*(n-3^(1/3)) = 0
( 2/3*n^-2 )
2/3*n^-2 = 0 // : 2/3
n^-2 = 0
n należy do O
( n-3^(1/3) )
n-3^(1/3) = 0 // + 3^(1/3)
n = 3^(1/3)
( n^5 )
1*n^5 = 0 // : 1
n^5 = 0
n = 0
n in { 0}
n = 3^(1/3)
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