$\lim_{x\to0}\left(\left(\frac{x+\tgx}{1-\cos x}\right)\right)$
$\int\left(3x\cdot\cos\left(x^3\right)\right)dx$
$22x-220$
$-6x\le48$
$e^{2x}y^2dx+\left(e^{2x}y-2y\right)dy=0$
$\left(\frac{1}{2}x-2z\right)^2$
$2\left(-1\right)-3\left(-1\right)+4$
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