$\lim_{x\to-3}\left(\frac{x^2+6x+9}{-24-5x-x^2}\right)$
$\frac{x^3}{\left(x-5\right)^2}$
$-\frac{x}{5}=15$
$\int\frac{x^{3}-2x+1}{4x^{3}-x}dx$
$4x+2\le x+1$
$\int\cos^7\left(2x\right).\sin^6\left(2x\right)dx$
$\frac{2x^2+4x}{4x}$
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