$\int\frac{e^u}{x^2}dx$
$\left(7x-6y\right)\left(7x+6y\right)$
$25x^{12}+2\left(5x^6\right)\left(4\right)+16$
$z=\cos\left(x+4y\right),\:x=5t^4,\:y=\frac{1}{t}$
$\lim_{x\to\infty}\left(\left(1-\frac{1}{\sqrt{3}x}\right)^x\right)$
$16x^2+64x$
$16x^2+48xy+32y^2$
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