$\frac{d^2y}{dx^2}\left(2\sin\left(x\right)-4y\right)$
$-4y^2+4$
$\left(7a^2-b^2\right)\left(7a^2+4b^2\right)$
$\frac{dy}{dx}=5y-3\:;y\left(2\right)=1$
$23nm+13nm$
$6=z+2$
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