$-2\cdot19$
$\frac{a^{-2}-i-2}{a^{-1}+b^{-1}}$
$\int x\cdot e^{\frac{1}{5}}dx$
$x^2-3x-10\ge0$
$9x^6-24x^3+16$
$\left(3a+5y\right)\left(3a-5y\right)$
$\sqrt{25^2}$
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