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"If origin is the orthocentre of a triangle formed by the points \\( ( \\cos \\alpha , \\sin \\alpha , 0 ) , ( \\cos \\beta , \\sin \\beta , 0 ) , \\)\n\\( ( \\cos \\gamma , \\sin \\gamma , 0 ) \\) then \\( \\sum \\cos ( 2 \\alpha - \\beta - \\gamma ) = \\)\n\\( \\begin{array} { l l l l } { \\text { (A) } 0 } & { \\text { (B) } 1 } & { \\text { (C) } 2 } & { \\text { (D) } 3 } \\end{array} \\)"

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