In the given figure, ∠B = 90° and ∠ADB = x°. Find :

(i) sin ∠CAB

(ii) cos² C° + sin² C°

(iii) tan x° - cos x° + 3 sin x°

Evaluate : tan 25° tan 65° - cot 25° cot 65°.

In △ ABC, ∠B = 90°, evaluate : cosec A cos C - sin A sec C.