$\frac{dy}{dx}=\frac{ae^{-kx}}{2+e^{-kx}}$
$2x^{\left(2\right)}+x-4$
$\left(5-2i\right)+\left(7+8i\right)$
$\frac{cos\left(a+b\right)}{cos\left(b\right)}$
$-5r+\:8r\:+\:5$
$\frac{3x+12+6+2x}{6}\:+\:\frac{6-x}{6}$
$8x+2$
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