$\frac { x ^ { 2 } - 16 } { x ^ { 2 } + 8 x + 16 }$
$4x^3-2x^2+2x-1\::\:2x+1$
$\lim_{x\to5}\left(\frac{12x-60}{x^2-6x+55}\right)$
$\lim_{x\to\infty}\left(\tan\left(\frac{1}{x}\right)\right)^x$
$196x^2y^4-225a^8$
$\int4xsen\left(5x^2+4\right)dx$
$2a^2+a=1$
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