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zQL5im - 1
Calculation: zQL5im - 1
1
/
d
+
1
/
f
=
1
/
F
1
/
d
+
1
/
f
=
1
/
F
$$\frac{1}{d}+\frac{1}{f}$$
=
$$\frac{1}{F}$$
1
/
d
=
1
/
F
-
1
/
f
$$\frac{1}{d}$$
=
$$\frac{1}{F}-\frac{1}{f}$$
d
=
1
/
(
1
/
F
-
1
/
f
)
$$d$$
=
$$\frac{1}{\frac{1}{F}-\frac{1}{f}}$$
