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Recently Referred Formulae

\sin n\omega t=\frac{1}{2j}(e^{jn\omega t}-e^{-jn\omega t})
\cos n\omega t=\frac{1}{2}(e^{jn\omega t}+e^{-jn\omega t})
\int_{0}^{T}\sin(2\pi nt/T)\sin(2\pi mt/T)dt
\int_{0}^{T}\cos(2\pi nt/T)\sin(2\pi mt/T)dt
\int_{0}^{T}\cos(2\pi nt/T)\cos(2\pi mt/T)dt