$\lim_{x\to7}\left(\frac{x^2+12x+35}{-63-2x+x^2}\right)$
$\frac{2x^4-6x^3+x-2}{x-2}$
$\left(\sqrt{x}+5\right)^2$
$2\cos^2x=\sin x$
$cot\:t\:\left(tan\:t\:+\:cot\:t\right)$
$\int\left(5x^2+3x+2\right)\left(x+3\right)^3dx$
$y=16+6x+4x^{-4}$
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