$\frac{da}{dt}=-10a+80t$
$-5\left(1-9\right)-19$
$20+90+51f+d$
$2h^2-5h=-1$
$\sqrt{7b-b^2}=42$
$x^3\frac{dy}{dx}+3x^2y=\frac{1}{x}$
$\int\frac{x^2+x}{\sqrt{x^2+4}}dx$
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