Find all critical points and local maxima and minima for each of the following functions:
a) ( ln(x² - 6x + 11) )
b) ( 2x² - 12x + 11 )

a) ( ln(x² - 6x + 11) )
a) ( {d}/{dx}ln(x² - 6x + 11) )
b) ( 2x² - 12x + 11 )
b) ( {d}/{dx}(2x² - 12x + 11) )