$\left(9x^3-12x^2\right)\left(9x^3+12x^2\right)$
$m^4.m^5.m+m^3.m^5.m^2$
$a+1-2x+a-1$
$\left(2^5\right)^4$
$\left(4x^3+8z\right)\cdot\left(4x-8z^3\right)$
$\lim_{x\to0}-\left(cscx-cotx\right)$
$-90\:-\:\left(\:-51\right)\:$
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