$\frac{x^2-7x+10}{x^2-9x+20}$
$\left(15\right)^2+\left(10\right)^2$
$2x^{2}y^{-8}$
$\left(2-3\right)^2+5\left(2\right)$
$-2x^2-34$
$-23+-155$
$\int_{\sqrt{x}}^{sinx}3lntdt$
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