$sec^2-tan^20$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{cos\left(x\right)}{\left(\frac{\pi}{2}-x\right)}\right)$
$1x^2-4x+0$
$\frac{d}{dx}\left(cos\left(5x\right)-5xe^{2y}\right)$
$\int8xe^{-\frac{x}{3}}dx$
$3x^2+8x=1$
$\lim_{x\to1}\frac{cosx-1}{x^2}$
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