$\frac{x^2+10+16}{x^2-4}$
$\left(y+21\right)\left(y-21\right)$
$2x^2-19x+10=0$
$-33+-1$
$\left(\frac{-16a^4b^6}{-8ab^2c}\right)$
$\lim_{x\to3}\frac{2x^2-8x+6}{x^2-2x-3}$
$\left(5m+\left(3n^2\right)\right)^3$
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