$\int\sqrt{1+4x^2}\left(8x\right)dx$
$dy=e^{-3y}dx$
$\lim_{x\to1}\left(\frac{sin\left(x\right)}{sin2x}\right)$
$\frac{3}{4}x+\frac{3}{4}x-\frac{3}{2}x$
$\int r^2\left(r^3-6\right)^3dr$
$\left(2+x\right)\left(3-x\right)\left(x-1\right)$
$\lim_{x\to\infty}\left(\frac{9x^4+9x^2}{3x^4+10}\right)$
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