$\int\frac{2x^2+5x-3}{\left(x+5\right)^3}dx$
$\lim_{x\to0}\frac{\cos\left(2x\right)-\cos\left(6x\right)}{x^2}$
$\sqrt{-720}$
$\left(2n+u\right)^5$
$78\cdot82$
$2x^2-6x=0$
$21x^2-20x-9=0$
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