$18.7+-29$
$18-\left|3\left(8-5\right)\right|$
$tanx\:tan\frac{x}{2}$
$\int5x^3e^{-2x}dx$
$x^2+20x+100=\left(x+10\right)^2$
$-2h^2+15h+8$
$\int_0^qx^2\left(q^2-x^2\right)dx$
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