$25xy-18ab-31ab-16xy$
$\tan2\cdot85.22$
$\left(x+1\right)^3-3x\left(x+1\right)-1$
$-x^2+1\ge0$
$5a\left(2ab-4a^2c\right)$
$4^{x-3}.5^{2-3x}=20$
$\int\sqrt{e^t}dt$
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