trolls2 hw4 item5

PART A:

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@DIV{1;2}V@Sup{2}ε@Sub{0}A(@DIV{1;d}-@DIV{1;d-l})
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PART B:

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@DIV{1;2}ε@Sub{0}AV@Sub{0}@Sup{2}@DIV{l;(d-l)@Sup{2}}
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