$2\sin\frac{3\pi}{8}\cos\frac{3\pi}{8}$
$\left(x^2+xy+y^2\right)\left(x-4\right)$
$\left(13a^5+12\right)\left(4a^2+6\right)$
$\frac{4x^4+4x^3-x+1}{x-3}$
$-8a^3+4+4a^6$
$8+2z+4+3z$
$\left(8z-9\right)^2$
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