$n\:=\:\left(3x\:+\:1\right)\left(3x\:+\:8\right)\:-\:\left(3x+4\right)^2$
$\lim_{x\to-1}\left(\frac{2x^4+4x^3+x+3}{x+1}\right)$
$0=3sin^2x-14sinx-5$
$\left(3x+5\right)\left(x-2\right)$
$-7\left(7+4\right)$
$\frac{8x^2+16x-2}{2x+3}$
$\int\cos\left(\ln\left(2x\right)\right)dx$
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