$\left(5+b^2\right)\left(5-b^2\right)$
$\int x^2\log\left(4x\right)dx$
$4z+8z$
$3\left(x\:+\:4\right)\:=\:3x\:+\:7$
$\lim_{x\to\infty}\left(\frac{4-x^2}{x^2-1}\right)$
$\left(\frac{7^2x^2y}{y^2}\right)^{-2}$
$\int\frac{35}{x^2\sqrt{x^2+81}}dx$
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