$\tan^{-1}\left(\frac{\cos x+\sin x}{\cos x-\sin x}\right)$
$\lim_{x\to\:-3}\frac{-5}{\left(x+3\right)^2}\:$
$x^4+x^2+2^3$
$28\::\:2\:$
$4x^{2}+8x+9x^{2}$
$\int_0^24xdx$
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