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## Homework Statement

Given that

f(x) = { x + 1 ...................; if x < 1

........{ 2 .........................; if x = 1

........{ [4(x-1)] / (x^2 - 1) ; if x > 1

Determine whether the function f(x) is continuous at x = 1

i dont know how to start..

can someone give me an idea to start..