From the previous exercise we know
Use this to establish the following:
- .
- .
- .
- Proof. Applying the solution from the previous exercise and the trig identity we have,
- Proof. Again we apply the solution from the previous exercise, and this time we use the pythagorean identity to obtain
- Proof. We apply the solution from the previous problem, the solution of part (a), and trig identities to derive the following: