Let f : R R be defined by f(x) = |x| - 1 |x| + 1 , then f is

JEE Main 2014 Mathematics question

Let be defined by , then f is

Answer: (2)

, so f is even and cannot be one-one (for example ). Writing , \frac{t-1}{t+1}$ = 1 -

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Question ID VK-104692