$\lim\:_{x\to\:7}\left(\frac{x^2-2x-35}{x-7}\right)$
$2\csc^2x+cotx=5$
$3x+\frac{1}{3x}$
$\left(8x+9\right)+\left(8x-9\right)$
$\frac{3x^2+7x-1}{x+3}$
$2x+9=5x$
$1+\tan^2a=\sec^3a\cos a$
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