$\frac{3x^{-1}y^{-3}}{2x^4y^0}$
$25x^2-1$
$\left(b^2\:-\:41\right)\left(b^2\:-\:11\right)=\:$
$2y-5y-2y+7y$
$3xy^2+7xy^2$
$\frac{dy}{dx}=\frac{y}{2x}+\frac{x}{2y}$
$x y ^ { 2 } + y ^ { 2 } = a$
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