$\arccos\left(cos\frac{\pi}{9}\right)$
$\frac{1}{8}\left(15.9\right)+\left(\frac{11}{4}\right)$
$15-2^2-1^3\cdot3$
$4a^mb^n\cdot ab^{m+1}$
$\left(2x-6t\right)^2$
$\int_0^{\frac{1}{2}}\cos^{-1}xdx$
$-23\:-\:\left(-2\right)$
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