$\frac{x}{4\sqrt{4-x^{2}}}+c^{\prime}$
$3y'+5y=20$
$\lim_{x\to0}\frac{1}{x}\sin\left(x\right)$
$4ab-5a;\:a=3\:b=2$
$x^2-9y^4$
$\frac{1}{4}xy-\frac{3}{5}xy+xy$
$-4x^2+19x-21=-7x^2+34x-33$
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