Expression 4: "z" StartFraction, 1 Over "f" minus "n" , EndFraction positive negative "n" StartFraction, 1 Over "f" minus "n" , EndFractionz1f−n+−n1f−n
equals=
00
4
Expression 5: "z" StartFraction, 1 Over "n" minus "f" , EndFraction positive "f" StartFraction, 1 Over "f" minus "n" , EndFractionz1n−f+f1f−n
equals=
11
5
Expression 6: 1 negative left parenthesis, "z" StartFraction, 1 Over "f" minus "n" , EndFraction positive negative "n" StartFraction, 1 Over "f" minus "n" , EndFraction , right parenthesis1−z1f−n+−n1f−n