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In a triangle ABC, acosB + b cosC + c co...

In a `triangle ABC`, acosB + b cosC + c cosA `=(a+b+c)/2` then

A

Triangle in isosceles

B

Triangle may be equilateral

C

`sin(A-B) + sin(B-C) + sin(C-A)=3/2`

D

`4sin( (A-B)/2) sin((B-C)/2) sin((C-A)/2)=1`

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A, B
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