$\cos\left(\theta\:\right)=\:\frac{8}{17}$
$\left(5m-9\right)\left(5m+9\right)$
$\int5xe^{8x^2+10}dx$
$\frac{x}{4}+10$
$-3x^2+2x+4$
$5\left(a+8\right)$
$\sqrt{40+\sqrt{81}}$
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