$x\frac{dy}{dx}+y=e^{-x}$
$cot\left(\frac{\pi}{3}\right)\cdot cot\left(\frac{\pi\:}{3}\right)$
$\left(10+b\right)\left(10-b\right)$
$\left(8x+6y\right)\left(8x-6y\right)$
$\int\frac{\sqrt{t}}{t+1}dt$
$x+14=121$
$64m^2n^2-4m^2n^2$
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