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In a triangle ABC prove that 1/2{(b+c) cos A + (c+a)Cos B + (a+b)Cos C} = bcos^2(C/2)+ccos^2(B/2)

In a triangle ABC prove that 1/2{(b+c) cos A + (c+a)Cos B + (a+b)Cos C} = bcos^2(C/2)+ccos^2(B/2)

 
 

Grade:11

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