$\left(a-7\right)\left(a-9\right)$
$\left(5x^2y-3x^2\right)^2\:$
$-12sen\left(3x\right)cos\left(x\right)$
$\left(r+2s\right)\left(r-2s\right)$
$\lim_{x\to0}\left(\frac{\sqrt{64-x}-8}{9x}\right)$
$-9x-4x^2-84$
$-805+94$
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