$21n^2+7n$
$4x^2+36x+9$
$\frac{dy}{dx}=\frac{1}{x}y+\sqrt{x^2+8}$
$\int_{0}^{a}\cos xdx$
$-9+36-5-15-23+15-36$
$\frac{dy}{dx}=\frac{x^2+2}{\sec^2\left(y\right)}$
$\left(2\frac{a^2}{5}\right)^3$
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