ans it fastt Q. cos4x cos8x-cos5x cos9x=0 if (A) cos12x=cos14x (B) sin13x=0 (C) sinx=0 (D) cosx=0 Share with your friends Share 0 Yashveer answered this In this ABC are correct answer -5 View Full Answer Thomas answered this Ans c -1 Thomas answered this B and c also correct 0