$\lim_{x\to\infty}\left(\frac{2}{x}\right)^x$
$\left(x+2\right)\frac{dy}{dx}=5y$
$\frac{9m^2n}{-4mn^2}$
$\frac{d}{dx}x^3\cos x^3$
$\int_0^{\frac{\pi}{14}}\left(sec7xtan7x\right)dx$
$\int t\:lm\left(t+1\right)dt$
$b-18=29$
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