$\int\frac{2}{x^3-4x^2-21x}dx$
$\sqrt{x+5}=7-\sqrt{20-x}$
$\frac{dy}{dx}\cdot\frac{1}{y}=sinx$
$-\left(9\:-\:7\right)\:-\:\left(5-\:\:9\right)$
$\int\frac{\left(x-1\right)}{x\left(x^2+1\right)}dx$
$\left(\frac{x}{y}\right)^4$
$\left(\frac{u-1}{2}\right)\left(u\right)^2$
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