$\left(a+b\right)\left(2a-b\right)$
$81a^2-\left(4a^2-3\right)^2$
$-16n^2+64n+3$
$\int\sin^23x\cos^23dx$
$4sin^2x-4cosx-5=0$
$\left(8-y^3\right)^2$
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