9. (i) Solve, for \(0 ^ { \circ } < x < 180 ^ { \circ }\), the equation \(\sin \left( 2 x + 50 ^ { \circ } \right) = 0.6\), giving your answers to 1 d. p.
(ii) In the triangle \(A B C , A C = 18 \mathrm {~cm} , \angle A B C = 60 ^ { \circ }\) and \(\sin A = \frac { 1 } { 3 }\).

1. Use the sine rule to show that \(B C = 4 \sqrt { } 3\).
2. Find the exact value of \(\cos A\). L