$\lim_{x\to x-2\pi\:}\left(\frac{x-2\pi\:}{sin\left(x\right)}\right)$
$3\:cot\:^2x\:b\:+\:6\:cot\:b\:+\:3$
$x=-2,y=-4\:z=1$
$\frac{12sin\left(x\right)}{x}+cos\left(x\right)$
$\sec x\tan x-5\csc^2x$
$\frac{x^2+11+28}{x+4}$
$x^2+6x-47=0$
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