1.

If A(cos alpha,sin alpha,0), B(cos beta,sin beta,0),C(cos gamma,sin gamma,0) are vertices of DeltaABC and let cos alpha+cos beta+cos gamma=3a,sin alpha+sin beta+sin gamma=3b, then find i) Circumcentreii) Centroidiii) Orthocentre

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ANSWER :(i) (0, 0, 0) (II) (a,b,0) (III) (3a,3b,0)


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