4. (s) Diben \( \operatorname{lan} \theta=-1.4826 \) dan \( 180^{\circ} \leq \theta \leq 360^{\circ} \) hilung sudul \( \theta \) Given than \( \tan \theta=-1.4826 \) ond \( 180^{\circ} \leq 0 \leq 360^{\circ} \). calculate angle \( \theta \)

Choose the correct answer from those given : \( \begin{array}{llll}\text { (1) In the opposite figure : } \\ \theta= \\ \begin{array}{llll}\text { (a) } 10^{\circ} & \text { (b) } 20^{\circ} & \text { (c) } 40^{\circ} & \text { (d) } 80^{\circ}\end{array}\end{array} \).

\( \cos ^ { 2 } 40 ^ { \circ } + \cos 50 ^ { \circ } + \tan 25 ^ { \circ } \times \operatorname { san } 65 ^ { \circ } \)

b. Se \( \alpha=-\frac{\pi}{2} \rightarrow \cos \alpha=0 \) esin \( \alpha=4 \). Aiutandoti con la circonferenza goniometrica, stabilisci se i seguenti valori sono positivi, negativi o nulti, \( \sin \left(-\frac{5}{2} \pi\right) ; \cos \frac{7}{6} \pi ; \sin 380^{\circ} ; \cos 452^{\circ} ; \sin 7 \pi ; \cos \left(-170^{\circ}\right) \).

Simplify the following expressions \( 6.1 \quad \frac{\sin 210^{\circ} \cos 300^{\circ} \tan 240^{\circ}}{\cos 120^{\circ} \tan 150^{\circ} \sin 330^{\circ}}\left[\begin{array}{l}{[\sin (-\theta)+\cos (360-\theta)]}\end{array}\right. \) If \( \tan x=m+\frac{1}{m}, 90^{\circ} \leq \) Calculate the value of \( x \)

What is the definition of the tangent function in relation to a right triangle?