$\int\frac{21}{\sqrt{x^2+9}}dx$
$\int\sqrt{9-e^{2x}}e^{2x}dx$
$\frac{dy}{dx}+ax=b$
$50-\left(-9\right)$
$\frac{10x^2-3x^3+11x+6}{x+2}$
$\left(5x^2-4x-3\right)^2$
$\frac{115.45}{100}$
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