Simplify (2/3 m+3/2 n)^2
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(2/3 m+3/2 n)²
= (2/3m)² + (3/2n)² + 2(2/3m × 3/2n)
= 4/9m² + 9/4n² + 2mn
(a+b)² = a²+b² + 2ab
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