[(m+2n)(m-2n)-(m-2n)∧2]÷(-3n)∧2

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[(m+2n)(m-2n)-(m-2n)∧2]÷(-3n)∧2
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[(m+2n)(m-2n)-(m-2n)∧2]÷(-3n)∧2
[(m+2n)(m-2n)-(m-2n)∧2]÷(-3n)∧2

[(m+2n)(m-2n)-(m-2n)∧2]÷(-3n)∧2
解[(m+2n)(m-2n)-(m-2n)∧2]÷(-3n)∧2
=[m^2-4n^2-(m^2-4mn+4n^2)]÷(-3n)∧2
=(4mn-8n^2)/9n^2
=(4m-8n)/9n