$\left(x+y^2\right)\left(x-y^2\right)\left(x^4+x^2y^4+y^8\right)$
$\int\frac{4}{\sqrt{1-4x^2}}dx$
$16x\:+\:24y$
$8a^2-16a-90$
$\left(x-12\right)\left(x-15\right)$
$6b-8b-3a-6b$
$\int u\sec^2udu$
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