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Let S = ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ π ± ≠ π π ∈ 2 , 0 x : ) , (– x . The sum of all distinct solutions of the equation 3 sec x + cosec x + 2(tan x – cot x) = 0 in the set S is equal to -

– 9 7 π
– 9 2 π
0
9 5 π

Correct answer: 0

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