User:Zeitgeist0/Sandbox

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a_k = \sum_{k=0}^{\infty} f(t)\cos(k \omega t)

b_k = \sum_{k=0}^{\infty} f(t)\sin(k \omega t)

\int_0^{2 \pi} \int_0^\pi \int_0^a r^2 \sin \theta \, dr \, d \theta \, d \phi

 \mathfrak{L} (s) \left\{ u(t) \right\} = \frac{1}{s}

 \mathfrak{L} (s) \left\{ \delta (t) \right\} = 1

 \mathfrak{L} (s) \left\{ t\,u(t) \right\} = \frac{1}{s^2}