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7.3: Identidades de ángulo doble
https://espanol.libretexts.org/Matematicas/Precalculo_y_Trigonometria/Libro%3A_Prec%C3%A1lculo_-_Una_investigaci%C3%B3n_de_funciones_(Lippman_y_Rasmussen)/07%3A_Ecuaciones_trigonom%C3%A9tricas_e_identidades/7.03%3A_Identidades_de_%C3%A1ngulo_doble
\[\begin{array}{l} {\sin ^{2} (\alpha )=\dfrac{1-\cos (2\alpha )}{2} } \\ {\sin (\alpha )=\pm \sqrt{\dfrac{1-\cos (2\alpha )}{2} } } \\ {\alpha =\dfrac{\theta }{2} } \\ {\sin \left(\dfrac{\theta }{2} ... $\begin{array}{l} {\sin ^{2} (\alpha )=\dfrac{1-\cos (2\alpha )}{2} } \\ {\sin (\alpha )=\pm \sqrt{\dfrac{1-\cos (2\alpha )}{2} } } \\ {\alpha =\dfrac{\theta }{2} } \\ {\sin \left(\dfrac{\theta }{2} \right)=\pm \sqrt{\dfrac{1-\cos \left(2\left(\dfrac{\theta }{2} \right)\right)}{2} } } \\ {\sin \left(\dfrac{\theta }{2} \right)=\pm \sqrt{\dfrac{1-\cos (\theta )}{2} } } \end{array}\nonumber$

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