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$t^2+\\var{a}$.

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$-\\var{b}-t$.

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$\\dfrac{t^2}{\\var{a}}$.

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$-(t^2)+\\var{a}t$.

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$t^3-\\var{b}t$.

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Find the values of the following expressions, given the stated value of $t$.

\n

$t=\\var{t}$

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