If in a /\ ABC, sum cos3A=1, then (A) /\...

If in a `/_\ ABC, sum cos3A=1,` then (A) `/_\ ABC` is a rilght angled triangle (B) `/_\ABC` is an obtuse angled triangle (C) `/_\ABC` is an acute angled triangle (D) In radius r of `/_\ABC` is either `sqrt(3)(s+a)or sqrt(3)(s+b) or sqrt(3)(s+c)`

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