Problem $2.$ For each problem below describe in words the integration technique you should use and how you know. What features of the problem are clues to a specific integration technique? You do not have to calculate the antiderivatives $($though it would be good practice...$)$

$($a$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}si{n}^3()co{s}^4()d$

$($c$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{ln(2x)}{x}dx$

$($b$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}{x}^2{e}^{-x}dx$

$($d$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{4-5x}{(x+1)(2-x)}$