$-\frac{5x^2+3}{4x}$
$\left(-30\right)-\left(-40\right)$
$\lim_{x\to1}\frac{\sqrt{x+2-\sqrt{3}}}{\sqrt{x-1}}$
$\frac{dy}{dx}=\frac{sin2x}{3y^2},y\left(0\right)=1$
$3+4x+4x^2$
$\frac{4x^2y^6}{2xy}$
$-4\tan x-2=6$
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