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D( n )
n^5 = 0
n^5 = 0
n^5 = 0
1*n^5 = 0 // : 1
n^5 = 0
n = 0
n in (-oo:0) U (0:+oo)
50 = 800/(n^5) // - 800/(n^5)
50-(800/(n^5)) = 0
50-800*n^-5 = 0
-800*n^-5 = -50 // : -800
n^-5 = 1/16
-5 < 0
1/(n^5) = 1/16 // * n^5
1 = 1/16*n^5 // : 1/16
16 = n^5
n^5 = 16 // ^ 1/5
n = 16^(1/5)
n = 16^(1/5)
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