(11) Find the exact value of \( \sin (2 x), \cos (2 x) \) and \( \tan (2 x) \) given the inforn tjon below. \( 81-4=77 \) \( \sin (x)=\frac{2}{9}, \frac{\pi}{2}<x<\pi \)

0) Find the exact value of \( \tan \left(22.5^{\circ}\right) \).

A plane takes off at an angle of \( 11^{\circ} \) to the horizontal. If the plane maintains a speed of \( 270 \mathrm{~km} / \mathrm{h} \), what horizontal distance has it travelled after flying for 2 minutes?

In un triangolo rettangolo, retto in \( C \), si conoscono l'ipotenusa \( c=251,47 \mathrm{~m} \) e l'angolo acuto \( \beta=43^{c}, 7025 \); determina il perimetro del triangolo. \( [605,36 \mathrm{~m}] \)

(\$) Find the exact value of the followings using ceference ingles. (YOU SHOULD SHOW ME THE WAY TO USE REFERENCE ANGLES TO GET CREDITS.) \[ \sec \left(-\frac{4 \pi}{3}\right)=-\sec \left(60^{\circ}\right) \]

В треугольнике \( A B C \) угол \( C \) равен \( 90^{\circ}, \operatorname{tg} A=\frac{33}{4 \sqrt{33}}, A C=4 \). Найдите 1B.