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Show that 2("bc"cosA+"ca"cosB+"ab"cosC)=...

Show that `2("bc"cosA+"ca"cosB+"ab"cosC)=a^(2)+b^(2)+c^(2).`

Text Solution

Verified by Experts

The correct Answer is:
`a^(2) + b^(2) + c^(2) = R.H.S.`
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