CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

sinx+sin3x+sin5x+sin7x=4cosxcos2xsin4x

Open in App
Solution

sinx+sin3x+sin5x+sin7xsinx+7x+sin3x+sin5x[sin(A+B)]sinC+sinD=2sinC+D2cosCD2Now,2sin(x+7x2)cos(x7x2)+2sin(3x+5x2)cos(3x5x2)2sin4xcos3x+2sin4xcosx2sin4x(cos3x+cosx)2sin4x[2cosC+D2cosCD2]2sin4x[2cos3x+x2cos3xx2]2sin4x×2cos2xcosx4sin4xcos2xcosx.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Standard Formulae 1
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon