$\sqrt{2^{9^{4^{-2^{-1}}}}}$
$\frac{1}{y}y'\:=-\frac{\sin\:\left(x\right)+1}{x-\cos\:\left(x\right)}$
$\left(2x-9\right)^3\left(3x-5\right)^2$
$\left(x^2-3x\right)\left(x^2+3x\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x}}{2x+1}\right)$
$\lim_{x\to a}\frac{\sqrt{b^2-x}-\sqrt{b^2-a}}{x-a}$
$x^2+3x+21=22$
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