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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3600 = 1/x // - 1/x
3600-(1/x) = 0
3600-x^-1 = 0
-1*x^-1 = -3600 // : -1
x^-1 = 3600
-1 < 0
1/(x^1) = 3600 // * x^1
1 = 3600*x^1 // : 3600
1/3600 = x^1
x = 1/3600
x = 1/3600
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