Answer :

Let θ = 60°


then,


3 sin 60° – 4 sin360°


= 3sinθ - 4sin3θ


We know that


Sin3θ = 3sinθ - 4sin3θ


3 sin 60° – 4 sin360°


= sin(3 × 60° )


= sin 180°


= 0


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