Saved Bookmarks
| 1. |
\sin 2 x %2B 2 \sin 4 x %2B \sin 6 x = 4 \cos ^ 2 x \cdot \sin |
|
Answer» L.H.S. = sin 2 x + 2 sin 4 x + sin 6 x= [sin 2 x + sin 6 x ] + 2 sin 4x= 2 sin 4 x cos 2 x + 2 sin 4x= 2 sin 4 x cos 2 x + 2 sin 4x= 2 sin 4 x (cos 2 x + 1)= 2sin4x(2cos x -1+1)= 2 sin 4 x (2 cos x )= 4cos x sin 4 x= R.H.S. |
|