prove :- cos 12 cos 24 cos 48 cos 84 = 1/16 Share with your friends Share 8 Varun.Rawat answered this LHS = cos 12° . cos 24° . cos 48° . cos 84°=142 cos 84° . cos 24° 2 cos 48° . cos 12°=14cos 84°+24° + cos84°-24°cos 48°+12° + cos48°-12°=14cos 108° + cos 60°cos 60° + cos 36°=14cos90°+18° + 12 12 + cos 36°=14- sin 18° + 1212 + cos 36°=1412 - 5-14 12 + 5+14=142-5+142+5+14=1643-53+5=1649-5=464=116=RHS 6 View Full Answer
