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Show that (cosA)/(a)+(cosB)/(b)+(cosC)/(...

Show that `(cosA)/(a)+(cosB)/(b)+(cosC)/(c)=(a^(2)+b^(2)+c^(2))/(2abc)`

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The correct Answer is:
`= (a^(2) + b^(2) + c^(2) )/( 2abc)`
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