$\lim_{x\to2}\left(\frac{\sqrt{x+2}}{x-4}\right)$
$\frac { x ^ { 5 } y ^ { - 4 } } { x y ^ { - 1 } }$
$\int_0^{2\pi}-7cos^2xdx$
$-2\tan a+2=4\tan a+6$
$1200-3x^2$
$\lim_{x\to0}\left(\sqrt{x^3-x^2}-7x\right)$
$-\left(13+2\right)+5+\left(7-16\right)$
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