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Let `S={xepsilon(-pi,pi):x!=0,+pi/2}`The sum of all distinct solutions of the equation `sqrt3secx+cosecx+2(tan x-cot x)=0` in the set S is equal to
A. `-(7pi)/(9)`
B. `-(2pi)/(9) `
C. `0`
D. `(5pi)/(9)`

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