$-3\:-\:-2\:+-6\:\cdot\left[\left(-15\right)+18\right]$
$\frac{3x^4}{\left(1+2x\right)^2}$
$\left(a+b\right)\left(a-b\right)\left(a^2b^2\right)$
$-2x^3+x^2+2x-1$
$\left(4-k\right)^2$
$v=\:\left(15-2x\right)\left(8-2x\right)\left(x\right)$
$\cos9x\sec81$
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