$sec\theta\:+tan\theta\:=\frac{cos\theta\:}{1-sin\theta\:}$
$2^{8^{x-2}}=4^{4^{x-1}}$
$\frac{y-x}{x}$
$\lim_{x\to3}\:\frac{5x^2-20x+15}{x-3}$
$\lim_{x\to0}\left(\frac{\cos\left(4x\right)-\cos\left(2x\right)}{x^2}\right)$
$\frac{d}{dx}\left(x^{\frac{2}{3}}+y^{\frac{2}{3}}=0\right)$
$\left(a-b\right)\left(a^3+b^3\right)$
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