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If alpha, beta, gamma in [0,2pi], then t...

If `alpha, beta, gamma in [0,2pi]`, then the sum of all possible values of `alpha, beta, gamma` if `sin alpha=-1/sqrt(2), cos beta=-1/sqrt(2), tan gamma =-sqrt(3)`, is

A

`(22pi)/3`

B

`(21pi)/3`

C

`(20pi)/3`

D

`8pi`

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