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D( x )
x < 0
x < 0
x in <0:+oo)
x^(9/2)*e^x = 0
x^(9/2) = 0
1*x^(9/2) = 0 // : 1
x^(9/2) = 0
x = 0
e^x = 0
x należy do O
x^(9/2)*e^x = 0 <=> x^(9/2) = 0 or x^(9/2)*e^x = 0 <=> e^x = 0
x = 0
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