$-31\left(2\right)$
$\sqrt{9x}-\:\sqrt{25x}$
$\frac{2x^2+5x-18}{x+4}$
$\int x^2\sqrt{36-x^2}dx$
$2\cdot0.1505\:+\:0.301$
$y^4+4y^2+4$
$\int_{\infty}^0\left(ze^{6z}\right)dz$
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