$(6$ points each$)$ Determine these indefinite integrals:

a$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{2x-1}{x^2-x+9}dx$

$6$a$)$

b$),{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\sqrt[\phantom{2}]{6x-1}dx$

$6$b$)$