$2x^3-4\:\:\:2x^3-6$
$\int\left(\frac{23x^2}{\sqrt{1-x^2}}\right)dx$
$8sec^2\left(\frac{x}{2}\right)=4$
$100x^4-81y^2$
$49m^2-121n^2$
$x^2-x-9$
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