A. 6sin 2θ+2 sin 4θ-2 sin6θ-sin 8θ
B. 6sin 2θ-2 sin 4θ-2 sin6θ-sin 8θ
C. 6sin 2θ+2 sin 4θ+2 sin6θ+sin 8θ
D. 6sin 2θ-2 sin 4θ-2 sin6θ+sin 8θ
The last terms in the expantions of sin 8θ, sin 9θ respectively are
If cos α+ cos β=0= sin α + sin β then cos(α - β)=
If 16 sin5 θ=asin 5 θ+b sin 3θ+c sin θ then
64cos3 θsin4 θ=