If a b c are on non zero and a + b + c is equals to zero prove that a square up on BC + b square Upon A C + c square Upon A B is equals to 0

Incorrecto así no se dice

I’m just going to answer this question for the sake of it. the population of china is approximately 1.43 billion

What do you think about music? do you like words? do you like dancing? do you like that kind of music? how long have you listened to this type of music? btw im in the same spanish class ; )