$\left(5-2p\right)\left(5+2p\right)$
$\frac{a}{\:x}+\frac{bx+c}{x^2+1}$
$\left(7-x^4\right)^2$
$\frac{5bc}{2c}\cdot\frac{6c}{10b}$
$x^2-10xy+25y^2$
$\lim_{x\to\infty}\left(1-sin\left(\frac{1}{5n}\right)\right)^{4n}$
$x^2\:-4x-144$
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