0 votes 0 votes a) 3/2 b) 2/3 c) 8/9 d) 8/13 Calculus isro-ece isro2011-ece engineering-mathematics calculus + – sh!va asked Feb 28, 2017 retagged Mar 10, 2019 by Naveen Kumar 3 sh!va 233 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes use the expansion of Cos 3x. Cos 3x=4cos^3 x - 3cos x. Hence, (Cos 3x +3 cos x)/4. Ans is B) 2/3 Abhisek Das answered Feb 28, 2017 Abhisek Das comment Share Follow See all 0 reply Please log in or register to add a comment.