Evaluate :

14 sin 30° + 6 cos 60° - 5 tan 45°.

In each case, given below, find the value of angle A, where 0° ≤ A ≤ 90°.

(i) sin (90° - 3A) . cosec 42° = 1

(ii) cos (90° - A) . sec 77° = 1

Show that :

tan 56° tan 28° tan 34° tan 62° = 1.