How many of the following relations is/are correct?(i) sin 2θ = 2 sinθ cos….

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How many of the following relations is/are correct?
(i)  sin 2θ = 2 sinθ cosθ                                                 
(ii)  sin 3θ = 3 sinθ – 4 sin³θ      
(iii)  cot θ + tan θ = 2 cosec 2 θ                                      
(iv)  cot θ – tan θ = 2 cot 2 θ
 

Options :-

1. 1
2. 2
3. 3
4. 4

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