$\frac{a^2}{4}+\frac{b^4}{9}$
$\left(5x+4\right)\left(x^2-x-12\right)=0$
$\left(2x-3\right)\left(2x-2\right)-2x\left(x-5\right)$
$12k=108$
$5x+18y-13x-14y$
$\sin30\:\frac{1}{2}$
$\lim_{x\to0}\left(1-3sin\left(x\right)\right)^{\frac{2}{x}}$
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