From the following figure, find :

(i) y

(ii) sin x°

(iii) (sec x° - tan x°)(sec x° + tan x°)

Use the given figure to find :

(i) sin x°

(ii) cos y°

(iii) 3 tan x° - 2 sin y° + 4 cos y°

In the given figure, triangle ABC is right-angled at B. D is the foot of the perpendicular from B to AC. Given that BC = 3 cm and AB = 4 cm. Find :

(i) tan ∠DBC

(ii) sin ∠DBA

In triangle ABC, AB = AC = 15 cm and BC = 18 cm, find cos ∠ABC.