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If `angleA and angleB` are acute angles such that cos A= cos B, then show then show that `angleA=angleB`.

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Construct `DeltaABC` , right - angled at A such that
`cosA=cosB`
`rArr(AC)/(AB)=(BC)/(AB)`
`rArrAC=BC`
`rArrangleB=angleA`

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