Use the statements below to find the size of angle \( x \). \[ \begin{array}{c}\text { Angle } x \text { is a multiple of } 12 . \\ \text { Angle } x \text { is acute. } \\ 2 \text { lots of angle } x \text { gives an obtuse angle. } \\ 3 \text { lots of angle } x \text { gives an obtuse angle. }\end{array} \]

\( = \sqrt { ( \operatorname { Sen } ^ { 2 } x - \operatorname { Cos } ^ { 2 } x ) ( \operatorname { Sen } ^ { 4 } x + \operatorname { Cos } ^ { 4 } x ) + \operatorname { Cos } ^ { 8 } x } \)

3. El ángulo \( \frac{2}{5} \pi \mathrm{rad} \) equivale en grados a \( \begin{array}{llll}\text { A. } 30^{\circ} & \text { B. } 36^{\circ} & \text { C. } 72^{\circ} & \text { D. } 108^{\circ}\end{array} \)

5) \( \operatorname{sen}^{2}\left(x^{2}+3\right)+\cos ^{2}\left(x^{2}+3\right) \)

3. El ángulo \( \frac{2}{5} \) mrad equivale en grados a \( \begin{array}{llll}\text { A. } 30^{\circ} & \text { B. } 36^{\circ} & \text { C. } 72^{\circ} & \text { D. } 108^{\circ}\end{array} \)

...f \( (\mathrm{x})=0,5 \sin (\mathrm{x}) \) parallel zur Gerade \( \mathrm{y}=-0,25 \mathrm{x}+3 \) ? \( \square 0 \quad \square \frac{\pi}{3} \square 0,5 \pi \quad \square \frac{2}{3} \pi \) \( \square \pi \quad \square \frac{1}{3} \pi \quad \square 1,5 \pi \quad \square 1 \frac{2}{3} \pi \)