[" In a "/ABC" ,if "D" is the midpoint o...

[" In a "/_ABC" ,if "D" is the midpoint of "BC" and "AD" is "],[" perpendicular to "AC" then "cos B=],[[" (A) "2ba],[" (B) "-bc],[" (C) "(b2+c2)ca],[" (D) "(c2+a2)ca]]

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