Trigonometric Functions

Step 1: Use the cosine rule to find angle .
By the cosine rule: Substitute the given values:

Step 2: Find .
Since , we have:

Step 3: Use the sine rule to find angle .
Using the sine rule for angle , we apply the half angle formula: Substitute :

Step 4: Find .
Since , we have:

Final Answer: (i) (ii)