$\lim_{x\to0}\left(1-\cos\left(x\right)\right)ctg\:\left(x\right)$
$\int\frac{4x^3-1}{x^4-x}dx$
$\int\left(x\left(3x-2\right)^4\right)dx$
$-2x^2-2y^2+4x-16y+2=0$
$\frac{d}{dx}\:x^2\sqrt{x^3}+a^3$
$\frac{x^3+2x^2+4x+1}{x^2}$
$\frac{a^3-64}{a-4}$
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