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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.16*10^-19 = (1.986*10^-25)/x // - (1.986*10^-25)/x
8.16*10^-19-((1.986*10^-25)/x) = 0
8.16*10^-19-1.986*10^-25*x^-1 = 0
0 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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