$36-64+2\cdot1\cdot9$
$\sec^2a-1$
$\int\left(8x+23\right)^{-2}dx$
$\frac{8ab-12bc+20b}{4b}$
$8x-4$
$\frac{5g}{9g^3}.\:\frac{15g}{25g^0}$
$\left(\frac{2}{5}-\frac{3}{7}m\right)^3$
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