$\int_{-\sqrt{4-2y^2}}^{\sqrt{4-2y^2}}\left(y\right)dx$
$\left(49-43\right)-\left(18+54\right)$
$12x^{12}-24x^9+12x^6$
$\csc^2x+1=-\cot^2x$
$\frac{2x-1}{\:4}=\frac{2}{2x+1}$
$\frac{2x-x+1}{x}$
$\frac{d^2}{dx^2}\sqrt{9-x^2}$
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