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Give examples of two one-one function f1...

Give examples of two one-one function `f_1 and f_2` from R to R such that `f_1 + f_2 : R rarr R` defined by : `(f_1+f_2)(x) = f_1 (x) + f_2(x)` is not one-one.

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MODERN PUBLICATION-RELATIONS AND FUNCTION-EXAMPLE
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