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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.4355 = (x+1)/x // - (x+1)/x
1.4355-((x+1)/x) = 0
(-1*(x+1))/x+1.4355 = 0
(-1*(x+1))/x+(1.4355*x)/x = 0
1.4355*x-1*(x+1) = 0
0.4355*x-1 = 0
(0.4355*x-1)/x = 0
(0.4355*x-1)/x = 0 // * x
0.4355*x-1 = 0
0.4355*x-1 = 0 // + 1
0.4355*x = 1 // : 0.4355
x = 1/0.4355
x = 2.29621125
x = 2.29621125
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