$4d\left(4d^2-2d\right)$
$cos\left(x^2-2x\right)xd$
$a^4+2a^2+1$
$\left(2x-3\right)\left(4x-2\right)$
$168\cdot125$
$2n+1=21$
$\left(-\frac{5}{9}\right)-0.7\infty$
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