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D( x )
x < 0
3.9*x^(10^-7) = 0
x < 0
3.9*x^(10^-7) = 0
3.9*x^(10^-7) = 0
3.9*x^(1/10000000) = 0 // : 3.9
x^(1/10000000) = 0
x = 0
x in (0:+oo)
(10^-15)/(3.9*x^(10^-7)) = 0
0 = 0
x należy do R
x in (0:+oo)
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