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If vec (alpha ) , vec (beta ) , vec (gam...

If `vec (alpha ) , vec (beta ) , vec (gamma) ` be unit vectors satisfying the condition ` vec (a) + vec(beta) + vec ( gamma) = vec ( 0) ` show that ` vec (alpha ) . vec(beta) + vec(beta ) .vec(gamma) + vec(gamma ) . vec(alpha ) = -3/2 `

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