(B) 3/4 cos2900一万sin250° 2 5. cos290° 3 sin 250° 4/3 (B) 2V3 4 3.

(B) 3/4cos2900?sin25025.cos2903sin2504/3(B)2V343

cos[2 sin^(-1) 3/4 + cos^(-1)3/4]

Evaluate : (i) (cos 3A - 2 cos 4A)/(sin 3 A + 2 sin 4A) , when A = 15^(@) (ii) (3 sin 3B + 2 cos(2B + 5^(@)))/(2 cos 3B - sin(2B - 10^(@))) , when B = 20^(@)

sin4A = 4sin A cos ^ (3) A-4cos A sin ^ (3) A