$-\left(-3x^2+2x\right)^3$
$3x-x+2x-3x$
$1+\frac{x^2}{4}$
$\sec a\cdot\cot a=\cos a$
$\left(2a+2\right)\left(2a+4\right)$
$\left(u+4\right)\left(u-6\right)$
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