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$$c = \sqrt{a^2 + b^2}$$$$c = \sqrt{a^2 + b^2}$$
This is an inline equation $c = \sqrt{a^2 + b^2}$.
$$F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx$$$$ \lvert x \rvert$$