(2m+3n)(2m-3n)-(3m-2n)(3m+2n)
=(4m²-9n²)-(9m²-4n²)
=4m²-9n²-9m²+4n²
=-5m²-5n²
(2m+3n)(2m-3n)-(3m-2n)(3m+2n)
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