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If tanfrac(B-C)2=x cotfracA2, then x =...

If `tanfrac(B-C)2=x cotfracA2`, then x =

A

(A) `(c-a)/(c+a)`

B

(B) `(a-b)/(a+b)`

C

(C) `(b-c)/(b+c)`

D

(D) `(b-c)/a`

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