$\frac{a^9}{a^3}$
$216+12$
$x^2-16x+81$
$\lim_{x\to3}\left(\frac{\sqrt{5x-1}-\sqrt{4x+1}}{2-x}\right)$
$\int\frac{7}{2}\sqrt[3]{x^4}dx$
$tan2x+1=0$
$x^2-9x+14>0$
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