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    • https://espanol.libretexts.org/Matematicas/Calculo_Integral_CLP-2_(Feldman_Rechnitzer_y_Yeager)/04%3A_Ap%C3%A9ndices/4.02%3A_N%C3%BAmeros_Complejos_y_Exponenciales/4.2.02%3A_El_Exponencial_Complejo
      \ begin {alinear*}\ cos\ theta\ cos\ phi &=\ frac {1} {4}\ grande (e^ {i\ theta} +e^ {-i\ theta}\ grande)\ grande (e^ {i\ phi} +e^ {-i\ phi}\ grande)\\ &=\ frac {1} {4}\ grande (e^ {i (\ theta a+\ phi...\ begin {alinear*}\ cos\ theta\ cos\ phi &=\ frac {1} {4}\ grande (e^ {i\ theta} +e^ {-i\ theta}\ grande)\ grande (e^ {i\ phi} +e^ {-i\ phi}\ grande)\\ &=\ frac {1} {4}\ grande (e^ {i (\ theta a+\ phi)} +e^ {i (\ theta-\ phi)} +e^ {i (-\ theta+\ phi)} +e^ {-i (\ theta+\ phi)}\ grande)\\ &=\ frac {1} {4}\ grande (e^ {i (\ theta+\ phi)} +e^ {-i (\ theta+\ phi)} +e^ {i (\ theta-\ phi)} + e^ {i (-\ theta+\ phi)}\ grande)\\ &=\ frac {1} {2}\ grande (\ cos (\ theta+\ phi) +\ cos (\ theta-\ phi)\ gran…

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