$\csc^2\cdot20$
$\frac{3a^{4x}-9b^{2y}}{3b^y+\sqrt{3a^{2x}}}$
$\frac{x^3a^5+xa^8}{x^2a^6}$
$\lim_{x\to0}\left(sin\:\theta\right)^{tan\:\theta}$
$\sec^{2}x+\tan^{2}x=5$
$\frac{-176-80}{64}$
$x^2-4x+\frac{4^2}{2}$
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