English: Because if you know the x sorry this is x, x_(B) then you can obtain what will be the Or if you know that x_(A,B) here will be able to know what should be the x_(B,B).
Telugu: లేదా ఇక్కడ x_(A,B)అనేది మీకు తెలిస్తే, x_(B,B) తెలుసుకోగలుగుతారు.