6.3 If \( \quad \tan x=m+\frac{1}{m}, 90^{\circ} \leq x \leq 270^{\circ} \) and \( m^{2}+\frac{1}{m^{2}}=1 \) Calculate the value of \( x \) without the use of a calculator.

З треугольнике \( K B R \) проведена высота \( B D \). Ззвестно, что \( \angle B K R=20^{\circ} \mathrm{n} \angle \) \( K B R=108^{\circ} \). Определи углы треугольника \( D B R \). \( \angle B D R=\square^{\circ} ; \) \( \angle D B R=\square^{\circ} ; \)

11. if \( \cos \theta=\frac{3}{3}, \theta \in Q_{1} \) then \( \cot \theta+\operatorname{cosec} \theta= \) \( \begin{array}{llll}\text { a) } 1 & \text { b) } 25 & \text { c) } 3 & \text { d) } 4\end{array} \)

find the fundamental periodicity of the following fonction \( y=-5 \sin \left(\frac{1}{4}(3-x)\right)+1 \)

a) \( \frac{\cos 68^{\circ}-\cos 22^{\circ}}{\sin 68^{\circ}-\sin 22^{\circ}} \)

Define the secant function in terms of a right triangle.