From the given figure, find : (i) cos x° (ii) x° (iii) 1/tan^2 x° - 1/sin^2 x° (iv) Use tan x°, to find the value of y.

(i) cos x° cos x° = Hence, cos x° = (ii) x° cos x° = cos x° = cos 60° Hence, x° = 60°. (iii) Hence, = -1. (iv) tan x° = ⇒ tan 60° = ⇒ ⇒ y = 10 = 17.32 Hence, y = 17.32 cm.