- #1

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- Homework Statement
- I am trying to understand how they got the line ##\Delta A_2 = \bar A - A_{min}## below

When I expand the expression above it ##A_{min} = (\bar L - \Delta L)(\bar W - \Delta W) ## I get ##A_{min} = \bar L \bar W - \Delta W \bar L - \Delta L \bar W + \Delta L \Delta W = \bar A + \Delta A_2##

- Relevant Equations
- Pls see below

Many thanks!