$\lim_{x\to-\frac{\pi}{2}}\left(2x^2cos\left(4x\right)\right)$
$\sqrt{\frac{a^3}{b^9}}x\:\frac{b^5}{a^5}$
$\left(2ab-b^2\right)$
$\left(6a+11b\right)\left(6a-11b\right)$
$\left(2^2\right)^3+\left(3^3\right)^1$
$\frac{x^2-15x+54}{x-6}$
$+\frac{2.7}{-3}$
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