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D( x )
x < 0
16*x^2 = 0
x < 0
16*x^2 = 0
16*x^2 = 0
16*x^2 = 0 // : 16
x^2 = 0
x = 0
x in (0:+oo)
(-12*x^(1/2))/(16*x^2) = 0
-3/4*x^(-3/2) = 0 // : -3/4
x^(-3/2) = 0
x należy do O
x belongs to the empty set
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