$x^{-1}$
$\left(-2\right)^4\left(-5\right)^2$
$68-\left(-93\right)-72+\left(-3+124\right)$
$9x-10x+y-7x+2y+3x$
$\frac{dy}{dx}y^2=\frac{x-1}{x+2}$
$\sqrt{\frac{1+\tan^2\left(x\right)}{1+\cot^2\left(x\right)}}$
$x^2-20x-25$
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