$\frac{dy}{dx}=-\frac{x^2}{2y}$
$x^2+5x-50=0$
$a+8^2$
$\left(b\:-\:5\right)\:\left(b\:+\:6\right)\:$
$\ln\left(e^x+1\right)\left(1-e^{-x}\right)$
$3 \cdot 36 x ^ { 2 } - 84 x y + 49 y ^ { 2 }$
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