$-\frac{2}{\left(1+2x\right)^2}$
$\frac{x^2-5x+1}{x^2-4x+3}$
$30x^2+13x+10$
$m^2-3m-28$
$8\sqrt{x}+9\sqrt[3]{x^2}+4\sqrt{x^3}$
$\sqrt{\left(x+8\right)^2-\left(x+9\right)\left(x+7\right)}$
$\lim_{x\to0}\left(\left(x+1\right)^{\left(\frac{1}{\cos\left(\cos\left(x\right)\right)-1}\right)}\right)$
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