$\frac{d}{dx}x^2+2xy-y^2=4x$
$7x+8y-42x$
$\int\left(x-2\right)sin\left(2x\right)dx$
$\frac{dy}{dx}=4x+\:5y+4$
$7x^2y-7x^2uy+17xy$
$\lim_{x\to0}\left(\frac{\arctan\left(x\right)-x}{x-\sin\left(x\right)}\right)$
$\left(\frac{1}{3}x^2+y^2\right)^2$
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