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If f(x)=|cos (x+alpha) , cos (x+beta) , ...

If `f(x)=|cos (x+alpha) , cos (x+beta) , cos (x+gamma)],[ sin (x+alpha) , sin (x+beta) ,sin (x+gamma) ],[ sin (beta-gamma), sin (gamma-alpha), sin (alpha-beta)]|` and
`f(0)=-2` then `overset(30)underset( r=1) sum |f(r)| `equals

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