Question: (a) Use the vector dot product to show that in HCBr3, cos (BrCBr) = 1 - 1.5 sin2(HCBr). (b) In HCBr3, HCBr = 107.2. Find

(a) Use the vector dot product to show that in HCBr3, cos (∠BrCBr) = 1 - 1.5 sin2(∠HCBr).
(b) In HCBr3, HCBr = 107.2°. Find  BrCBr in HCBr3.

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