$\int\frac{1}{5x^2-9}dx$
$\int_2^{\infty}\left(\frac{1}{x\sqrt{2+x^2}}\right)dx$
$\left(1-2\right)^2-3$
$x^2+12x+27=0$
$\left(3a-5\right)\left(2a+6\right)$
$\int\left(x\sqrt{8x^2+1}\right)dx$
$\frac{2n^4-n^3-2n+5}{n^2+2n+1}$
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