[ t2-2 ( t-3 )]

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[ t2-2 ( t-3 )]
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[ t2-2 ( t-3 )]
[ t2-2 ( t-3 )]

[ t2-2 ( t-3 )]
t²-2t(t²-2t+6)
=t²-2t³+4t²-12t
=-2t³+5t²-12t