$\frac{dy}{dx}=\frac{1}{e^x+1}$
$\left(2x+0.0025\right)\left(2x+0.0025\right)$
$1\:2\:a\:x\:+\:5\:3\:a\:x$
$13x=32+5x$
$x^2-y-2=0$
$\frac{\left(4x-8\right)}{-3x+5}$
$\left(2-z\right)^3$
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