1) y=arctg(x/2)+9x^2
y ' =(1/(1+x^2/4))*1/2+18x
2) y=sin(ln(1-2x))
y ' =cos(ln(1-2x))*1/(1-2x)*(-2)=(-2*cos(ln(1-2x)))/(1-2x)
1) y=arctg(x/2)+9x^2
y ' =(1/(1+x^2/4))*1/2+18x
2) y=sin(ln(1-2x))
y ' =cos(ln(1-2x))*1/(1-2x)*(-2)=(-2*cos(ln(1-2x)))/(1-2x)