Integral,turev,geometri

2:
y=lnx^x
y=xlnx
y'=lnx+x.1/x
y'=1+lnx

3:
lim ln(1+ 1/x)^x --> ln(lim (1+ 1/x)^x)= lne=1

4:
3x+3xy'+2yy'=0
3.1+3.1y'-2y'=0
y'(1,-1)=-3

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x=16