Express 1/(x(1-3x)) in partial fractions.
1/(x(1-3x))= A/x+ B/(1-3x) 1= A(1-3x) + B(1-3x)
when x=0 1=A
when x= 1/3 1=B/3 so B=3
1/(x(1-3x))= 1/x + 3/(1-3x)
LB
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