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In `triangleABC, 2(bc cosA+ac cosB+ab cosC)=`

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in Trigonometry by (123k points)
In `triangleABC, 2(bc cosA+ac cosB+ab cosC)=`
A. `a+b+c`
B. `2(a+b+c)`
C. `a^(2)+b^(2)+c^(2)`
D. `2(a^(2)+b^(2)+c^(2))`
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Correct Answer - C
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