$2-2\cos^2x=2\sin^2x$
$\left(8\:-\:a\right)^2$
$x^2-x-6<0$
$x2xvxux$
$5^2.3^2$
$xy-x^{1.7}y^{2.2}$
$\int\left(x^2\left(\sqrt{9-x^2}\right)\right)dx$
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