$a+a^{-1}=3$
$t i n ( t + 1 )$
$\sqrt{x}.\frac{1}{x}$
$\left(x^4-1\right)\left(x^2+1\right)$
$\frac{2}{x-4}=\frac{1}{x+2}$
$\int\frac{2x}{e^2}dx$
$x^2+14+\left(14\right)^2$
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