Solve for A and B$!$

Consider the following function.

$f(x)=ln(1+2x),a=1,n=3,0\mathrm{.}6x1\mathrm{.}4$

$($a$)$ Approximate $f$ by a Taylor polynomial with degree $n$ at the number $a.$

$T_3(x)=$

$|R_3(x)|$