$\lim_{x\to0}\cos\left(\frac{\pi}{x}\right)$
$\frac{x}{7};\:x=14$
$\lim_{x\to-\infty}\left(x\left(\arctan\left(x\right)+\arccos\left(\frac{1}{x}\right)\right)\right)$
$x^2-30x+99$
$\frac{dy}{dx}=-\frac{1}{50}\left(y-16\right)$
$1^2+2^2+\left(-3^2\right)$
$2x^3-18x^3$
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