$\left(-x^2-4x\right)^2$
$\frac{2a\left(1-b\right)}{\left(1-b\right)}$
$\infty^2-3\infty+9$
$\:\left(\:-c-b-s\right)\:^2$
$3e+7-e\:2e+10+2e-3$
$2\cos^25x-1$
$5c+2cd-3c+9d+8cd+7$
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