$9n^2+6n-8$
$5\sqrt{20}-3\sqrt{45}$
$1+\frac{1}{2}\cos\left(x\right)$
$\lim_{x\to0}\left(\frac{\sqrt{w}}{\sqrt{w+3-\sqrt{3}}}\right)$
$5x^2+3x-4\ge0$
$\int\left(y\frac{2}{5}-5y\frac{3}{4}-2y\frac{4}{5}-\sqrt{y^7}\right)dy$
$\frac{dy}{dx}=\frac{y}{1+x}^2$
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