$\int e^{\frac{x}{2}}cos\:\frac{x}{2}dx$
$a^2-a^2+4a^2-a^2+a^2b-2a^2b+9$
$-6-3x+5x$
$\lim_{x\to\infty}\left(t-\sqrt{2t^2+4t}\right)$
$\frac{z^3+1}{z^2-1}$
$\left(81+x\right)\left(9+x\right)$
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