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     EduGorilla 
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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
     

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