Hi guys! How do you solve this question?

1. Tan 75° (using the compound angle formulae)

8. a) Develop formulas for cot(α+β) and cot(α - β).

b) Find cot 75° + cot 15° without using tables.

10. a) Develop formulas for the following.

i) tan 2α

ii) cot 2α

Thank you!