$\int\frac{x+3}{x^2-2x-3}dx$
$wyw-v$
$\lim_{x\to0}\left(\cos\left(x\right)-1+\frac{1}{2}x^2\right)\cdot\frac{1}{2x^4}$
$\left(k^2+3k+2\right)^2$
$5x^2+3x+25$
$\frac{\left(+3\right)\left(-4\right)}{6}$
$\frac{\left(ab\right)^3-1^3}{ab^2-1}$
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