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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X = (e^8)/x-1 // - (e^8)/x-1
X-((e^8)/x)+1 = 0
-e^8*x^-1 = -(X+1) // : -e^8
x^-1 = (X+1)/(e^8)
-1 < 0
1/(x^1) = (X+1)/(e^8) // * x^1
1 = x^1*((X+1)/(e^8)) // : (X+1)/(e^8)
1/((X+1)/(e^8)) = x^1
x = 1/((X+1)/(e^8))
x = 1/((X+1)/(e^8))
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