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X⇒O √4+× - √4-× ( √4+× + √4-×)
LIM X ( √4+× + √4-×)
X⇒O 4+× + 4-×
LIM X ( √4+× + √4-×)
X⇒O 8
LIM 0 ( √4+0 + √4-0) = 0.(2+2)/8=0/8=0
X⇒O 8