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2t t. (T9)5⋅(t8)4(t4)4⋅(t15)4=2013.. T2+4t+4. 2t 2 - 4t. (T^3-1)^2-(T^3-1)(T^3+1).
(T9)5⋅(t8)4(t4)4⋅(t15)4=2013.. T2+4t+4. 2t 2 - 4t. (T^3-1)^2-(T^3-1)(T^3+1).

See also