$x\frac{dy}{dx}+4y=\frac{4}{x^4}$
$\frac{6x-1}{3}-2$
$\lim_{x\to1}\left(\frac{ln\:x^3}{x^2-1}\right)$
$5\left(-2\right)^3\left(2\right)^2\left(16\left(-2\right)^2\left(2\right)+42\right)+\left(16-28\left(-2\right)\right)$
$w^2-6w-40$
$\frac{\sin\left(x\right)\cos\left(x\right)}{1-\cos^2\left(x\right)}=\cot\left(x\right)$
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