$nx-mx$
$\lim_{x\to-5}\:\:\frac{\left(x-3\right)\left(x+4\right)}{x+5}$
$\sec x=\frac{\cot x+\tan x}{\csc x}$
$x2-8x+4$
$\lim_{x\to0}\left(\frac{\sqrt{x+5}-\sqrt{5}}{x-4}\right)$
$sin4x=0$
$sec^2x+3tan^2x=13$
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