(m-2n-3t)(m+2n+3t)
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(m-2n-3t)(m+2n+3t)
(m-2n-3t)(m+2n+3t)
(m-2n-3t)(m+2n+3t)
=[m-(2n+3t)][m+〔2n+3t〕
=mm-(2n+3t)(2n+3t)
=mm-4nn-12nt-9tt
(m-2n-3t)(m+2n+3t)
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