$\frac{-x-19}{\left(x^2+3x+19\right)^2},x$
$\frac{x^3-19x-30}{x^3-3x^2-10}$
$\left(3a^2y+2x^2y^3\right)^2$
$\cos a=\cos b$
$\int\frac{x^4-1}{\left(x^3-x^2+9x-9\right)}dx$
$\lim_{x\to\infty}\left(10xe^{\frac{5}{x}}-10x\right)$
$\frac{-0}{0+1}$
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