$\frac{2x-1}{\left(2x+1\right)^2}$
$\lim_{x\to0}\left(\frac{3x^2+8x}{7x^3+2x+6}\right)$
$\frac{dy}{dx}\left(3x^{-4}-5x^{-1}=y\right)$
$0.94-0.27$
$\frac{-7}{10y^2}-\frac{5}{6y^3}$
$\int\left(e^{\frac{x}{2}}\right)dx$
$x-4x^2$
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