$34-\frac{2.35+6}{2}$
$\int\frac{8sec^2x}{tan^2\left(x\right)-4}dx$
$\lim_{x\to4}\left(\frac{4-x^2}{3-\sqrt{x^2+5}}\right)$
$\left(2x-z\right)^2$
$\frac{-2e^{-x}-e^y}{e^{-x}+e^y}$
$s^7t^6u^{-1}\:x\:s^0t^4u^{-1}$
$15x+6xy+10+4y$
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