$2-\frac{1}{x^2-x}-\frac{3}{x+1}$
$y^3+3y^2-4y=0$
$45\left(-0.008851\right)$
$\lim_{x\to-\pi}\left(\left(x+\pi\right)cotc\right)$
$x^2-y^2-z^2;\:x=-2;\:y=-4$
$-\frac{15000}{-30}$
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