$2x^2+9x+90$
$\frac{9^7}{9^4}$
$\left(2n-4\right)\left(2n+4\right)$
$\frac{\sin\left(2x\right)}{2cos^2x}$
$\left(7p^4+4a\right)^2$
$\lim_{x\to0}\left(\frac{x^7lnx}{7}\right)$
$2x^2-5x+1=3$
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