1.

If f:RrarrR_(1)f(x) is a differentiable bijective function, then which of the following may be true.

Answer»

`(f(x)-x)f''(x)LT0,AAx in R`
`(f(x)-x)f''(x)GT0,AAx in R`
If `f(x)-x)f''(x)gt0,THENF(x)=f^(-1)(x)` has no solution
If `f(x)-x)f''(x)gt0, then f(x)=f^(-1)(x)` has atleast a REAL solution

Answer :B::C


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