I'm getting a incorrect output from the Professor

[Kadeh Ikpe]

Hello, I'm using the Sage program for one of my math labs and it doesn't print out the same output as the professor. I'm gonna post a picture of the professor's sage and mine and it's giving me the wrong output.

[Urs Hackstein]

Sage gives not a wrong result: your function f(t) is different from
the function of your prof. Look at the coefficient of t^2
:))

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