$5x^3\:-\:55x^2\:+\:140x\:$
$\frac{d}{dx}\left(x^{13}\left(5x-2\right)^7\right)$
$sec3x=2$
$\lim_{x\to\:-3}\frac{-5}{\left(x+3\right)^2}\:$
$25a+10$
$tan2x=\frac{2cotx}{cot^2x-1}$
$x^4+4x^2-21$
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