|x| = (x²)½
El valor absoluto de x es siempre positivo.
La raíz cuadrada de x² no es siempre positiva.
|x| = (x²)½ = { x si x≥0
-x si x<0
(x²)½ = { x si x≥0
-x si x<0
|x| siempre va a ser igual a (x²)½
Las dos van a depender de x si x≥0 o de -x si x<0
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Katherine Montero 