\(\int{\frac{dx}{(x+1)(x-2)}}\)=( )

A、\(\frac{1}{3}\ln \left| \frac{x-2}{x+1} \right|+C\)
B、\(\frac{1}{6}\ln \left| \frac{x-2}{x+1} \right|+C\)
C、\(\frac{1}{2}\ln \left| \frac{x-2}{x+1} \right|+C\)
D、\(\frac{1}{4}\ln \left| \frac{x-2}{x+1} \right|+C\)