Categoria: formulae.app / Matemáticas / Trigonometría / Fórmulas del Ángulo Mitad
$$sen(\frac{\theta}{2})= \pm \sqrt{\frac{1 - cos \theta}{2}}$$
$$cos(\frac{\theta}{2})= \pm \sqrt{\frac{1 + cos \theta}{2}}$$
$$tan(\frac{\theta}{2})= \pm \sqrt{\frac{1 - cos \theta}{1 + cos \theta}}$$