[tex] {(7 {m}^{3} + 3n) }^{2} = 49 {m}^{6} + 42 {m}^{3} n + 9 {n}^{2} [/tex]
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[tex] {(7 {m}^{3} + 3n) }^{2} = 49 {m}^{6} + 42 {m}^{3} n + 9 {n}^{2} [/tex]