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12.1: Trigonometría
https://espanol.libretexts.org/Ingenieria/Libro%3A_Electromagnetica_II_(Ellingson)/12%3A_F%C3%B3rmulas_matem%C3%A1ticas/12.01%3A_Trigonometr%C3%ADa
$e ^ { j \theta } = \cos \theta + j \sin \theta \nonumber$ $\cos \theta = \frac { 1 } { 2 } \left( e ^ { j \theta } + e ^ { - j \theta } \right) \nonumber$ \[\sin \theta = \frac { 1 } { j 2 } \l... $e ^ { j \theta } = \cos \theta + j \sin \theta \nonumber$ $\cos \theta = \frac { 1 } { 2 } \left( e ^ { j \theta } + e ^ { - j \theta } \right) \nonumber$ $\sin \theta = \frac { 1 } { j 2 } \left( e ^ { j \theta } - e ^ { - j \theta } \right) \nonumber$ $\sin (a \pm b)=\sin a \cos b \pm \cos a \sin b \nonumber$ $\cos (a \pm b)=\cos a \cos b \mp \sin a \sin b \nonumber$ $\sinh \theta=\frac{1}{2}\left(e^{+\theta}-e^{-\theta}\right) \nonumber$

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