$\frac{2x^2}{x^3-3}$
$\frac{x^4-x+1}{x+2}$
$\frac{1}{2}^0$
$\frac{\cos^2y}{1+\sin y}$
$-99.4+\left(-72.8\right)$
$\frac{2}{\sec\left(x\right)}-\sec\left(x\right)$
$\left(2a^3+7b\right)\left(2a^3-7b\right)$
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