$\lim_{x\to\infty}\left(\frac{e^{\frac{x}{19}}}{x}\right)$
$\frac{1+16t^2}{\left(4t\right)^3}$
$\int\sin^3\left(6a\right)\cos\left(6a\right)da$
$bc\cos\left(a\right)+ca\cos\left(b\right)=c^2$
$x^3+3x^2-4x$
$25b^2-54b^2$
$\int6x^2\left(2x^3+2\right)^7dx$
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