trolls hw3 item2

PART A:

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@DIV{2kQ;a@Sup{2}}(@RT{a@Sup{2}+z@Sup{2}}-z)
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PART B:

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@DIV{2kQ;a@Sup{2}}(1-@DIV{z;@RT{a@Sup{2}+z@Sup{2}}})
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