$\lim_{x\to-4}\left(\frac{\sqrt{x}}{\sqrt{x+4}}\right)$
$\left(6+5n\right)+\left(4n-8\right)$
$7cosxsin^2x$
$25x-10x+15x-5x$
$0.8\cdot50$
$-x-10x^3$
$x^2+16x+324$
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