From the figure (1) given below, find the values of :

(i) 2 sin y - cos y

(ii) 2 sin x - cos x

(iii) 1 - sin x + cos y

(iv) 2 cos x - 3 sin y + 4 tan x

In ∆ABC, ∠A = 90°. If AB = 7 cm and BC - AC = 1 cm, find :

(i) sin C

(ii) tan B