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in a triangle ABC , (b+c) ( bc ) cos...

in a triangle ABC `, (b+c) ( bc ) cos A + (a +c) (ac) cos B + ( a+b) (ab) cos C ` Is

A

`a^2 +b^2 +c^2`

B

`a^3 +b^3 +c^3`

C

`(a +b +C)(a^2 +b^2 +c^2)`

D

`(a +b +c ) )(ab + bc + ca)`

Text Solution

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The correct Answer is:
B
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