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In A B C ,= if (a+b+c)(a-b+c)=3a c , th...

In ` A B C ,=` if `(a+b+c)(a-b+c)=3a c ,` then find `/_Bdot`

A

(A) `angle B=60^@`

B

(B) `angle B=30^@`

C

(C) `angle C=60^@`

D

(D) `angleA+ angleC=90^@`

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