$\sqrt{4+6\cdot10}+3\left(5^2-2\right)$
$4x^{2}+4x-7$
$\frac{5^{-1}}{-9^0}$
$\int_{-\infty}^0ae^{ax}dx$
$\frac{6x^2+21x+15}{2x+5}$
$\frac{\left(2-\sqrt{x}\right)}{x\left(4-x\right)}$
$\int\frac{x^2-7}{x-3\left(x^2+x+5\right)}dx$
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