defence exam INET Mock Test Mathematics Trigonometry Trigonometric Identities

sin θ + sin 3θ + sin 5θ + sin 7θ is equal to

1
cos θ cos 2θ sin 4θ 
2
2 cos θ cos 2θ sin 4θ 
3
4 cos θ cos 2θ sin 4θ 
4
None of the above 
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