$4\cdot\left(8d+24\right)$
$\cos^2+\cos^2\sin^2$
$6x^2-12x^4+24x^6-36x^8$
$324\cdot1$
$\frac{n^6+1}{n^2+1}$
$4x^3-8x$
$b\:+\:7\:-\:8b$
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