$cos^{-1}\left(cos\left(-\frac{3\pi}{8}\right)\right)$
$\int\:cos\left(5t\right)\:cos\left(10t\right)\:dt$
$\int\frac{3x^3+2x^2-5x-9}{x-2}dx$
$7a-2a+4$
$x^2\frac{dy}{dx}=1+x$
$1+\cos10y=2\cos^{2}5y$
$52.71-13.72$
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