$-3^2-7\left(-3\right)-9$
$\frac{4^{-2}y^{-3}}{4y^{-2}}$
$t^2-6t+8$
$4\left(3n-5\right)$
$5x^3-4x^2-4x^3+3x^2$
$-3a+-8a^5$
$\frac{d}{dx}secx+tany=xy$
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