Kirk Weber
08/11/2023 · Elementary School
\( \left. \begin{array} { c } { \cos ( 40 ) } \\ { \cos ( 60 + 20 ) = \cos 60 \cdot \cos 20 + \left\{ \begin{array} { l } { \cos 20 = 0,9397 } \\ { \sin 20 = 0,3420 } \end{array} \right.} \\ { \frac { 1 } { 2 } \cdot \sin \cdot \sin 20 } \end{array} \right. \)
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Para calcular \(\cos(60 + 20)\), usa la fórmula del coseno de la suma y los valores conocidos de \(\cos(60)\), \(\cos(20)\), \(\sin(60)\) y \(\sin(20)\). Para \(\frac{1}{2} \cdot \sin \cdot \sin 20\), asegúrate de que el argumento de \(\sin\) esté completo.
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