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Please help with this question. Thank you. 2.5.33. Prove that the image of the function f: R - R , f(x) = 1 + x2

Please help with this question. Thank you.

2.5.33. Prove that the image of the function f: R - R , f(x) = 1 + x2 is the interval [0 , 1) . Do not use calculus

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