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It is proved that the limit x ^ 2 + 2x + 4 = 12 when x tends to 2 Proof by the definition of the limit of higher number function My proof process is that there exists ε > 0, so that | x ^ 2 + 2x + 4-12 | = | X-2 | x + 4|
When x tends to 2, | x + 4|
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