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If the sum of all values of theta , 0 l...

If the sum of all values of ` theta , 0 le theta le 2 pi ` satisfying the equation ` (8 cos 4 theta - 3) ( cot theta + tan theta -2 ) ( cot theta + tan theta + 2) = 12 ` is ` k pi `, then k is equal to :

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