$\frac{4a^2-16}{2a+4}$
$\left\{+3\:-6\:+9\:\right\}-\left(41-\left(9-16\right)\right)$
$\sqrt{3}\sec\left(2x\right)-2=0$
$\left(\left(\frac{x}{y^3}\right)^{\frac{1}{2}}\right)^{\frac{2}{3}}$
$\int\frac{12x^2}{2x+1}dx$
$20a^2+4a^2b-9b-45$
$\sqrt{x}+3-1$
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