$\sin2x=-\cos x$
$\left(8+x^4\:\right)\left(\sqrt{8}+x^2\:\right)\left(\sqrt[4]{8}+x\right)\left(\sqrt[4]{8}-x\right)$
$\left(\frac{1}{4}y^2\right)^2$
$\left(-2^2\right)\left(-3^2\right)$
$100n^2-n-20$
$330\:+\:301\:$
$\int\left(xe^{9-x^2}\right)dx$
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