$\left(-5+a^2\right)\left(5+a^2\right)$
$\int\left(-\frac{2}{x^2}\right)dx$
$\left\{\left(10x^3\right)^2\right\}^5$
$-1-5+3x-1$
$682\:+\:-245\:$
$7\sqrt{3}\cdot\sqrt{a^2}\cdot\sqrt{b^2}$
$25x^2=100x-118$
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