a^m-1*a³-2a^m*a^4-3a²*a^m+2

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a^m-1*a³-2a^m*a^4-3a²*a^m+2a^m-1*a³-2a^m*a^4-3a²*a^m+2a^m-1*a³-2a^m*a^4-3a&

a^m-1*a³-2a^m*a^4-3a²*a^m+2
a^m-1*a³-2a^m*a^4-3a²*a^m+2

a^m-1*a³-2a^m*a^4-3a²*a^m+2
=a^(m+2)-2a^(m+4)-3a^(m+4_
=a^(m+2)-5a^(m+4)