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Given that f (n theta ) = (2 sin 2 theta...

Given that `f (n theta ) = (2 sin 2 theta )/( cos 2 theta - cos 4 n theta ) and f (theta) + f (2 theta) + f ( 3 theta) +…+ f (n theta) = (sin lamda theta)/( sin theta sin mutheta) ` then the vlaue

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