$\frac{25-k^2}{k^2\:-10k+25}$
$\int\frac{x^2+3x-2}{\left(x+1\right)}dx$
$12x^2-60x+75$
$\frac{dz}{dt}=-3e^{t+z}$
$\lim_{x\to-\infty}\left(\frac{2x^3-2x^2+x-3}{x^3+2x^2-x+1}\right)$
$3x^2-2x-1$
$\lim_{x\to0}\left(\frac{5^t-4^t}{t}\right)$
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