In `triangleABC , angleA= 60^(@)` prove that `BC^(2)= AB^(2)+AC^(2)- AB . AC`
Channel: Doubtnut
Date: 2019-12-27

In `triangleABC , angleA= 60^(@)` prove that `BC^(2)= AB^(2)+AC^(2)- AB . AC`

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