$\frac{2a^2+2b^2}{2}$
$t^2-t+1$
$2^8\cdot5^2$
$\lim_{x\to3}\frac{x^2-9}{\left(x+3\right)\left(2x+1\right)}$
$\left(3w+12z\right)\left(3w-12z\right)$
$\int\:x^2\:e^{3x\:}dx$
$\left(5xy+4y\right)^2$
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