$1-\frac{1}{1-\frac{2}{3}}$
$\int_0^{\frac{\pi}{2}}\left(3\cos\left(12x\right)\cos\left(13x\right)\right)dx$
$\frac{2x}{3}-5<x+\frac{1}{2}$
$\int_0^2\left(\frac{10}{\sqrt{4-x^2}}\right)dx$
$a^4-4a^2-16$
$\left(3x-7y\right)^2$
$-3-\left[-1-\left(-7+8\right)-5\right]$
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