Question: simple algebra manipulation

if I have a variable A_:=diff(A(t)/B(t),t); which gives me A_ := (diff(A(t), t))/B(t)-A(t)*(diff(B(t), t))/B(t)^2 what command do I use to split the second term after the minus sign so I get: A_ := (diff(A(t), t))/B(t)-A(t)/B(t)*(diff(B(t), t))/B(t); Any suggestions ??
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