Problem $4$:

Find the following integrals:

$(2)(8$ point$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x^2+3}{x^2-3x+2}dx$

$($b$)(8$ points$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{1-cosx}{1+sinx}dx$

$($c$)$ points$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{1-e^x}{1+e^x}dx$