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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1800 = ln(2)/x // - ln(2)/x
1800-(ln(2)/x) = 0
-ln(2)*x^-1 = -1800 // : -ln(2)
x^-1 = 1800/ln(2)
-1 < 0
1/(x^1) = 1800/ln(2) // * x^1
1 = (1800/ln(2))*x^1 // : 1800/ln(2)
1/(1800/ln(2)) = x^1
x = 1/(1800/ln(2))
x = 1/(1800/ln(2))
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