Q12 part IV experts give solution

Q12 part IV experts give solution 12. Solve foc (i) 2 cos (ii) cos 1 (iii) sin (x + — (iv) cos (2x-3(PÅ'J 2 (v) 2 cos (3x= 150) = I(vi) tan2 (vii) 3 tan2 (2K — 200) = (viii) cos 2 (ix) sin2 x + sin2 300 = I (x) cos2 300 + cos2 x = 1 (xi) cos2 300 + sin2 2r = 1 (xii) sin2 600 + cos2 (3x — 90) = I 13. If 4 cos2 x = 3 and x is an acute angle;fil the value of : (iii) cos 3x (ii) cos2 x + coe x (iv) sin 2.x _ 01 14. In A ABC, LB = 900, = y units, units, AC = 2 units and angle A f,

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