$\lim_{x\to0}\frac{-2\left(1-\cos\left(x\right)\right)}{x^2}$
$\int2x\cdot y^3dx$
$\frac{d}{dx}ln\sqrt{\frac{1+tanx}{1-tanx}}$
$x^6-16x^4y$
$+\left(-5+1\right)$
$22\cdot4>88\cdot22$
$\frac{1}{2}\left(8x+6y\right)+4y-3x$
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