(uv)' = u'v + uv' u = x^2 v = ln2x u' = 2xv' = 1/x(x^2*ln2x)' = 2x*ln2x + x = x(2ln2x+1)0,5(2ln1+1) = 0,5(2*0+1)=0,5
y'=2x*ln2x+x^2* 1/2x * 2 = 2x*ln2x+x
