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If f: R->R is an invertible function suc...

If `f: R->R` is an invertible function such that `f(x) and f^-1(x)` are symmetric about the line `y=-x,` then (a) `f(x)` is odd (b) `f(x) and f^-1(x)` may be symmetric (c) `f(c)` may not be odd (d) none of these

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