$\left(1+x^2\right)y'=x$
$k^2+18k+17$
$\frac{2\sin\left(a\right)+\cos\left(a\right)^2}{\cos\left(a\right)+\sin\left(a\right)}$
$\sqrt[3]{2+5^2}$
$3\left(7\right)^3-2\left(6\right)^3+\left(7\right)\left(6\right)$
$2-2t\le t-5$
$\frac{\left(5x^2-x^3\right)}{x^3+5}$
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