$\left(x-22\right)\left(x+15\right)$
$\left(7x^2+3x+9\right)+\left(5x^2-x+6\right)$
$\int3sen\left(2x\right)dx$
$\lim_{x\to-4}\left(\frac{x^2+4x+4}{x+2}\right)$
$\lim_{x\to0}\frac{\left(2+x\right)^n-2^n}{x}$
$2x^2+24xy+16y^2$
$\left(\sqrt{1-x}\right)\left(1+x\right)$
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