\( \sin \frac { \sin \theta } { 1 + \cos \theta } = \frac { 1 - \cos \theta } { \sin \theta } \)

35. Calcular: \( F=2 * \sqrt{1-2 \cos \left(\frac{\pi}{3}\right)=\operatorname{sen}\left(\frac{\pi}{3}\right)} \) \( \begin{array}{llll}\text { A) } \frac{\sqrt{3}}{2} & \text { B) } \frac{1}{2} & \text { C) } \sqrt{3}+1 & \text { D) } 1-\sqrt{3}\end{array} \)

\( \begin{array}{ll}\text { (i) } \sin \theta=\square & \text { (ii) } \cos (90-\theta)=\square \\ \text { (iii) } \tan (90-\theta)=\square & \text { (iv) } \tan \theta=\square\end{array} \)

19. Comprobar en lo general la siguiente identidad \( \operatorname{sen} A \cdot \tan A+\cos A \equiv \sec A \)

Six Trigonometric Functions on the Unit Circle Find all six trig functions for the following radians on the unit circle. \( \begin{array}{ll}\text { 19. } t=\pi & \text { 20. } t=\frac{4 \pi}{3}\end{array} \)

20. Resolver la ecuación \( 2 \cos ^{2} \varepsilon-\cos \varepsilon-1=0 \)