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If `I` is the incenter of a triangle ABC, then the ratio `I A : I B : I C` is equal to (a) `cos e c A/2: cos e c B/2: cos e c C/2` (b) `sinA/2:sinB/2:sinC/2` (c) `secA/2:secB/2:secC/2` (d) none of these

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