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D( x )
e^x = 0
e^x = 0
e^x = 0
x należy do O
x in (-oo:+oo)
(-2*e^5*x)/(e^x) = 0
(-2*e^5*x)/(e^x) = 0 // * e^x
-2*e^5*x = 0
-2*e^5*x = 0 // : -2*e^5
x = 0
x = 0
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