$\frac{x}{2}=\frac{7}{x}-\frac{5}{2}$
$2xe^ydx+\left(x^2e^y+1\right)dy=0$
$sec^2\left(x\right)+tan^2\left(x\right)cos\left(2x\right)=2sin^2\left(x\right)+1$
$\frac{d}{dx}xy^2+x^2y$
$\frac{1}{3}x+6\le-1$
$\lim_{x\to0}\left(\frac{\sin\left(14x\right)}{x}\right)$
$\left(45-18+81\right)$
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