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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000000 = 3000*(x/x+1)^20-1 // - 3000*(x/x+1)^20-1
1-(3000*(x/x+1)^20)+1000000 = 0
1-3000*(x/x+1)^20+1000000 = 0
1-3000*2^20+1000000 = 0
1-3000*2^20+1000000 = 0
1000000-3145727999 = 0
-3144727999 = 0
-3144727999 = 0
x belongs to the empty set
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