$\left(cos\left(5x\right)-4cos^3x\right)secx$
$\frac{dr}{d\theta}+r\tan\theta=9\sec\theta$
$\lim_{x\to0}\left(\frac{8x^3+5x^2+3x}{-2x^3+3x+2}\right)$
$x^2+35x+300$
$cot\left(x\right)cos\left(x\right)-cot\left(x\right)$
$\frac{1}{x^3-2x+1}$
$8cot^2x+12cot\:x-8$
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