$\lim_{x\to0}\left(x\cos\left(\frac{1}{x}\right)\right)$
$\:\frac{6x^5+5x^4+x^2+2x}{3x+1}$
$\frac{d}{dx}\left(\frac{3x}{y}-8x^3-6=3y\right)$
$\left|\left(2x+y\right)\left(2x-y\right)\right|^2$
$\left(a+2x^2\right)^3$
$\sin\left(\frac{\pi}{2}-x\right)=\cos x$
$\int_4^8\left(xe^{-x}\right)dx$
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