Find the value of:

cos² 60° + sec² 30° + tan² 45°

Find the value of :

tan² 30° + tan² 45° + tan² 60°

Find the value of :

3 sin² 30° + 2 tan² 60° - 5 cos² 45°

Prove that :

sin 60° cos 30° + cos 60°. sin 30° = 1