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

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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