cos(pi/8)+cos(3 pi/8)+cos(5 pi/8)+cos(7pi/8) Share with your friends Share 2 Hunar answered this Use Cosx+cosy =2cosx+y/2 . cosx-y/2 -12 View Full Answer Parminder Singh answered this cos(pi/8)+cos(3 pi/8)+cos(5 pi/8)+cos(7pi/8)=0 3 Samridhi answered this The answer is 1/8 Detailed solution is given in this photo -4 Neeha answered this Ans=1/8 3
