The determinant of a 3x3 matrix can be calculated using the formula:
$\left|\begin{array}{ccc}a & b & c \\ d & e & f \\ g & h & i\end{array}\right| = aei + bfg + cdh - ceg - bdi - afh$
Applying this formula to the given matrix, we get:
$f(x) = (x^3+1)(-1)(1) +
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